Browsing by Subject "PRETERM BIRTH"

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  • Plunkett, Jevon; Doniger, Scott; Orabona, Guilherme; Morgan, Thomas; Haataja, Ritva; Hallman, Mikko; Puttonen, Hilkka; Menon, Ramkumar; Kuczynski, Edward; Norwitz, Errol; Snegovskikh, Victoria; Palotie, Aarno; Palotie, Leena; Fellman, Vineta; DeFranco, Emily A.; Chaudhari, Bimal P.; McGregor, Tracy L.; McElroy, Jude J.; Oetjens, Matthew T.; Teramo, Kari; Borecki, Ingrid; Fay, Justin; Muglia, Louis (2011)
  • Philips, Elise M.; Santos, Susana; Trasande, Leonardo; Aurrekoetxea, Juan J.; Barros, Henrique; von Berg, Andrea; Bergstroem, Anna; Bird, Philippa K.; Brescianini, Sonia; Chaoimh, Carol Ni; Charles, Marie-Aline; Chatzi, Leda; Chevrier, Cecile; Chrousos, George P.; Costet, Nathalie; Criswell, Rachel; Crozier, Sarah; Eggesbo, Merete; Fantini, Maria Pia; Farchi, Sara; Forastiere, Francesco; van Gelder, Marleen M. H. J.; Georgiu, Vagelis; Godfrey, Keith M.; Gori, Davide; Hanke, Wojciech; Heude, Barbara; Hryhorczuk, Daniel; Iniguez, Carmen; Inskip, Hazel; Karvonen, Anne M.; Kenny, Louise C.; Kull, Inger; Lawlor, Debbie A.; Lehmann, Irina; Magnus, Per; Manios, Yannis; Melen, Erik; Mommers, Monique; Morgen, Camilla S.; Moschonis, George; Murray, Deirdre; Nohr, Ellen A.; Andersen, Anne-Marie Nybo; Oken, Emily; Oostvogels, Adriette J. J. M.; Papadopoulou, Eleni; Pekkanen, Juha; Pizzi, Costanza; Polanska, Kinga; Porta, Daniela; Richiardi, Lorenzo; Rifas-Shiman, Sheryl L.; Roeleveld, Nel; Rusconi, Franca; Santos, Ana C.; Sorensen, Thorkild I. A.; Standl, Marie; Stoltenberg, Camilla; Sunyer, Jordi; Thiering, Elisabeth; Thijs, Carel; Torrent, Maties; Vrijkotte, Tanja G. M.; Wright, John; Zvinchuk, Oleksandr; Gaillard, Romy; Jaddoe, Vincent W. V. (2020)
    Author summaryWhy was this study done? Maternal smoking during pregnancy is an important risk factor for various birth complications and childhood overweight. It is not clear whether this increased risk is also present if mothers smoke during the first trimester only or reduce the number of cigarettes during pregnancy. The associations of paternal smoking with birth and childhood outcomes also remain unknown. What did the researchers do and find? We conducted an individual participant data meta-analysis using data from 229,158 families from 28 pregnancy and birth cohorts from Europe and North America to assess the associations of parental smoking during pregnancy, specifically of quitting or reducing smoking and maternal and paternal smoking combined, with preterm birth, small size for gestational age, and childhood overweight. We observed that smoking in the first trimester only did not increase the risk of preterm birth and small size for gestational age but was associated with a higher risk of childhood overweight, as compared to nonsmoking. Reducing the number of cigarettes during pregnancy, without quitting, was still associated with higher risks of these adverse outcomes. Paternal smoking seems to be associated, independently of maternal smoking, with the risks of childhood overweight. What do these findings mean? Population strategies should focus on parental smoking prevention before or at the start of, rather than during, pregnancy. Future studies are needed to assess the specific associations of smoking in the preconception and childhood periods with offspring outcomes. Background Fetal smoke exposure is a common and key avoidable risk factor for birth complications and seems to influence later risk of overweight. It is unclear whether this increased risk is also present if mothers smoke during the first trimester only or reduce the number of cigarettes during pregnancy, or when only fathers smoke. We aimed to assess the associations of parental smoking during pregnancy, specifically of quitting or reducing smoking and maternal and paternal smoking combined, with preterm birth, small size for gestational age, and childhood overweight. Methods and findings We performed an individual participant data meta-analysis among 229,158 families from 28 pregnancy/birth cohorts from Europe and North America. All 28 cohorts had information on maternal smoking, and 16 also had information on paternal smoking. In total, 22 cohorts were population-based, with birth years ranging from 1991 to 2015. The mothers' median age was 30.0 years, and most mothers were medium or highly educated. We used multilevel binary logistic regression models adjusted for maternal and paternal sociodemographic and lifestyle-related characteristics. Compared with nonsmoking mothers, maternal first trimester smoking only was not associated with adverse birth outcomes but was associated with a higher risk of childhood overweight (odds ratio [OR] 1.17 [95% CI 1.02-1.35],Pvalue = 0.030). Children from mothers who continued smoking during pregnancy had higher risks of preterm birth (OR 1.08 [95% CI 1.02-1.15],Pvalue = 0.012), small size for gestational age (OR 2.15 [95% CI 2.07-2.23],Pvalue <0.001), and childhood overweight (OR 1.42 [95% CI 1.35-1.48],Pvalue <0.001). Mothers who reduced the number of cigarettes between the first and third trimester, without quitting, still had a higher risk of small size for gestational age. However, the corresponding risk estimates were smaller than for women who continued the same amount of cigarettes throughout pregnancy (OR 1.89 [95% CI 1.52-2.34] instead of OR 2.20 [95% CI 2.02-2.42] when reducing from 5-9 to = 10 to 5-9 and
  • Athanasiou, Antonios; Veroniki, Areti Angeliki; Efthimiou, Orestis; Kalliala, Ilkka; Naci, Huseyin; Bowden, Sarah; Paraskevaidi, Maria; Martin-Hirsch, Pierre; Bennett, Philip; Paraskevaidis, Evangelos; Salanti, Georgia; Kyrgiou, Maria (2019)
    Introduction There are several local treatment methods for cervical intraepithelial neoplasia that remove or ablate a cone-shaped part of the uterine cervix. There is evidence to suggest that these increase the risk of preterm birth (PTB) and that this is higher for techniques that remove larger parts of the cervix, although the data are conflicting. We present a protocol for a systematic review and network meta-analysis (NMA) that will update the evidence and compare all treatments in terms of fertility and pregnancy complications. Methods and analysis We will search electronic databases (CENTRAL, MEDLINE, EMBASE) from inception till October 2019, in order to identify randomised controlled trials (RCTs) and cohort studies comparing the fertility and pregnancy outcomes among different excisional and ablative treatment techniques and/or to untreated controls. The primary outcome will be PTB ( Ethics and dissemination Ethical approval is not required. Results will be disseminated to academic beneficiaries, medical practitioners, patients and the public.
  • Merid, Simon Kebede; Novoloaca, Alexei; Sharp, Gemma C.; Kupers, Leanne K.; Kho, Alvin T.; Roy, Ritu; Gao, Lu; Annesi-Maesano, Isabella; Jain, Pooja; Plusquin, Michelle; Kogevinas, Manolis; Allard, Catherine; Vehmeijer, Florianne O.; Kazmi, Nabila; Salas, Lucas A.; Rezwan, Faisal I.; Zhang, Hongmei; Sebert, Sylvain; Czamara, Darina; Rifas-Shiman, Sheryl L.; Melton, Phillip E.; Lawlor, Debbie A.; Pershagen, Goran; Breton, Carrie V.; Huen, Karen; Baiz, Nour; Gagliardi, Luigi; Nawrot, Tim S.; Corpeleijn, Eva; Perron, Patrice; Duijts, Liesbeth; Nohr, Ellen Aagaard; Bustamante, Mariona; Ewart, Susan L.; Karmaus, Wilfried; Zhao, Shanshan; Page, Christian M.; Herceg, Zdenko; Jarvelin, Marjo-Riitta; Lahti, Jari; Baccarelli, Andrea A.; Anderson, Denise; Kachroo, Priyadarshini; Relton, Caroline L.; Bergstrom, Anna; Eskenazi, Brenda; Soomro, Munawar Hussain; Vineis, Paolo; Snieder, Harold; Bouchard, Luigi; Jaddoe, Vincent W.; Sorensen, Thorkild I. A.; Vrijheid, Martine; Arshad, S. Hasan; Holloway, John W.; Haberg, Siri E.; Magnus, Per; Dwyer, Terence; Binder, Elisabeth B.; DeMeo, Dawn L.; Vonk, Judith M.; Newnham, John; Tantisira, Kelan G.; Kull, Inger; Wiemels, Joseph L.; Heude, Barbara; Sunyer, Jordi; Nystad, Wenche; Munthe-Kaas, Monica C.; Raikkonen, Katri; Oken, Emily; Huang, Rae-Chi; Weiss, Scott T.; Anto, Josep Maria; Bousquet, Jean; Kumar, Ashish; Soderhall, Cilla; Almqvist, Catarina; Cardenas, Andres; Gruzieva, Olena; Xu, Cheng-Jian; Reese, Sarah E.; Kere, Juha; Brodin, Petter; Solomon, Olivia; Wielscher, Matthias; Holland, Nina; Ghantous, Akram; Hivert, Marie-France; Felix, Janine F.; Koppelman, Gerard H.; London, Stephanie J.; Melen, Erik (2020)
    Background Preterm birth and shorter duration of pregnancy are associated with increased morbidity in neonatal and later life. As the epigenome is known to have an important role during fetal development, we investigated associations between gestational age and blood DNA methylation in children. Methods We performed meta-analysis of Illumina's HumanMethylation450-array associations between gestational age and cord blood DNA methylation in 3648 newborns from 17 cohorts without common pregnancy complications, induced delivery or caesarean section. We also explored associations of gestational age with DNA methylation measured at 4-18 years in additional pediatric cohorts. Follow-up analyses of DNA methylation and gene expression correlations were performed in cord blood. DNA methylation profiles were also explored in tissues relevant for gestational age health effects: fetal brain and lung. Results We identified 8899 CpGs in cord blood that were associated with gestational age (range 27-42 weeks), at Bonferroni significance, P <1.06 x 10(- 7), of which 3343 were novel. These were annotated to 4966 genes. After restricting findings to at least three significant adjacent CpGs, we identified 1276 CpGs annotated to 325 genes. Results were generally consistent when analyses were restricted to term births. Cord blood findings tended not to persist into childhood and adolescence. Pathway analyses identified enrichment for biological processes critical to embryonic development. Follow-up of identified genes showed correlations between gestational age and DNA methylation levels in fetal brain and lung tissue, as well as correlation with expression levels. Conclusions We identified numerous CpGs differentially methylated in relation to gestational age at birth that appear to reflect fetal developmental processes across tissues. These findings may contribute to understanding mechanisms linking gestational age to health effects.
  • Yokoyama, Yoshie; Jelenkovic, Aline; Hur, Yoon-Mi; Sund, Reijo; Fagnani, Corrado; Stazi, Maria A.; Brescianini, Sonia; Ji, Fuling; Ning, Feng; Pang, Zengchang; Knafo-Noam, Ariel; Mankuta, David; Abramson, Lior; Rebato, Esther; Hopper, John L.; Cutler, Tessa L.; Saudino, Kimberly J.; Nelson, Tracy L.; Whitfield, Keith E.; Corley, Robin P.; Huibregtse, Brooke M.; Derom, Catherine A.; Vlietinck, Robert F.; Loos, Ruth J. F.; Llewellyn, Clare H.; Fisher, Abigail; Bjerregaard-Andersen, Morten; Beck-Nielsen, Henning; Sodemann, Morten; Krueger, Robert F.; McGue, Matt; Pahlen, Shandell; Bartels, Meike; van Beijsterveldt, Catharina E. M.; Willemsen, Gonneke; Harris, Jennifer R.; Brandt, Ingunn; Nilsen, Thomas S.; Craig, Jeffrey M.; Saffery, Richard; Dubois, Lise; Boivin, Michel; Brendgen, Mara; Dionne, Ginette; Vitaro, Frank; Haworth, Claire M. A.; Plomin, Robert; Bayasgalan, Gombojav; Narandalai, Danshiitsoodol; Rasmussen, Finn; Tynelius, Per; Tarnoki, Adam D.; Tarnoki, David L.; Ooki, Syuichi; Rose, Richard J.; Pietilainen, Kirsi H.; Sorensen, Thorkild I. A.; Boomsma, Dorret I.; Kaprio, Jaakko; Silventoinen, Karri (2018)
    Background: The genetic architecture of birth size may differ geographically and over time. We examined differences in the genetic and environmental contributions to birthweight, length and ponderal index (PI) across geographical-cultural regions (Europe, North America and Australia, and East Asia) and across birth cohorts, and how gestational age modifies these effects. Methods: Data from 26 twin cohorts in 16 countries including 57 613 monozygotic and dizygotic twin pairs were pooled. Genetic and environmental variations of birth size were estimated using genetic structural equation modelling. Results: The variance of birthweight and length was predominantly explained by shared environmental factors, whereas the variance of PI was explained both by shared and unique environmental factors. Genetic variance contributing to birth size was small. Adjusting for gestational age decreased the proportions of shared environmental variance and increased the propositions of unique environmental variance. Genetic variance was similar in the geographical-cultural regions, but shared environmental variance was smaller in East Asia than in Europe and North America and Australia. The total variance and shared environmental variance of birth length and PI were greater from the birth cohort 1990-99 onwards compared with the birth cohorts from 1970-79 to 1980-89. Conclusions: The contribution of genetic factors to birth size is smaller than that of shared environmental factors, which is partly explained by gestational age. Shared environmental variances of birth length and PI were greater in the latest birth cohorts and differed also across geographical-cultural regions. Shared environmental factors are important when explaining differences in the variation of birth size globally and over time.
  • Persson, Martina; Opdahl, Signe; Risnes, Kari; Gross, Raz; Kajantie, Eero; Reichenberg, Abraham; Gissler, Mika; Sandin, Sven (2020)
    Introduction The complex etiology of autism spectrum disorder (ASD) is still unresolved. Preterm birth ( Author summaryWhy was this study done? Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by persistent impairments in social communication and restricted and repetitive behaviors. The etiology remains unresolved. Length of gestation, including preterm birth, has been linked to risk of ASD, but reliable estimates of risks for the whole range of gestational ages (GAs) are lacking. The primary objective of this study was to provide a detailed and robust description of ASD risk across the entire range of GA while taking fetal sex and size at birth into account. What did the researchers do and find? This study was based on population-based data from national medical registries in three Nordic countries-Sweden, Finland, and Norway-and included 3,526,174 singletons born 1995 to 2015. Relative risks (RRs) of ASD by GA at birth were estimated with log binominal regression. The RR of ASD increased by each week of GA, pre- as well as postterm, from 40 to 24 weeks of gestation and from 40 to 44 weeks of gestation, independently of sex and birth weight for GA. What do these findings mean? On a population level, the risks of ASD were increased in children born either pre- or postterm, including children born close to week 40. We found that the risk of ASD increased weekly, with each week further away from 40 weeks of gestation.
  • Santos, S.; Voerman, E.; Amiano, P.; Barros, H.; Beilin, L. J.; Bergstrom, A.; Charles, M-A; Chatzi, L.; Chevrier, C.; Chrousos, G. P.; Corpeleijn, E.; Costa, O.; Costet, N.; Crozier, S.; Devereux, G.; Doyon, M.; Eggesbo, M.; Fantini, M. P.; Farchi, S.; Forastiere, F.; Georgiu, V.; Godfrey, K. M.; Gori, D.; Grote, V.; Hanke, W.; Hertz-Picciotto, I.; Heude, B.; Hivert, M-F; Hryhorczuk, D.; Huang, R-C; Inskip, H.; Karvonen, A. M.; Kenny, L. C.; Koletzko, B.; Kupers, L. K.; Lagström, H.; Lehmann, I.; Magnus, P.; Majewska, R.; Mäkelä, J.; Manios, Y.; McAuliffe, F. M.; McDonald, S. W.; Mehegan, J.; Melen, E.; Mommers, M.; Morgen, C. S.; Moschonis, G.; Murray, D.; Ni Chaoimh, C.; Nohr, E. A.; Andersen, A-M Nybo; Oken, E.; Oostvogels, A. J. J. M.; Pac, A.; Papadopoulou, E.; Pekkanen, J.; Pizzi, C.; Polanska, K.; Porta, D.; Richiardi, L.; Rifas-Shiman, S. L.; Roeleveld, N.; Ronfani, L.; Santos, A. C.; Standl, M.; Stigum, H.; Stoltenberg, C.; Thiering, E.; Thijs, C.; Torrent, M.; Tough, S. C.; Trnovec, T.; Turner, S.; van Gelder, M. M. H. J.; van Rossem, L.; von Berg, A.; Vrijheid, M.; Vrijkotte, T. G. M.; West, J.; Wijga, A. H.; Wright, J.; Zvinchuk, O.; Sorensen, T. I. A.; Lawlor, D. A.; Gaillard, R.; Jaddoe, V. W. V. (2019)
    Objective To assess the separate and combined associations of maternal pre-pregnancy body mass index (BMI) and gestational weight gain with the risks of pregnancy complications and their population impact. Design Individual participant data meta-analysis of 39 cohorts. Setting Europe, North America, and Oceania. Population 265 270 births. Methods Information on maternal pre-pregnancy BMI, gestational weight gain, and pregnancy complications was obtained. Multilevel binary logistic regression models were used. Main outcome measures Gestational hypertension, pre-eclampsia, gestational diabetes, preterm birth, small and large for gestational age at birth. Results Higher maternal pre-pregnancy BMI and gestational weight gain were, across their full ranges, associated with higher risks of gestational hypertensive disorders, gestational diabetes, and large for gestational age at birth. Preterm birth risk was higher at lower and higher BMI and weight gain. Compared with normal weight mothers with medium gestational weight gain, obese mothers with high gestational weight gain had the highest risk of any pregnancy complication (odds ratio 2.51, 95% CI 2.31- 2.74). We estimated that 23.9% of any pregnancy complication was attributable to maternal overweight/obesity and 31.6% of large for gestational age infants was attributable to excessive gestational weight gain. Conclusions Maternal pre-pregnancy BMI and gestational weight gain are, across their full ranges, associated with risks of pregnancy complications. Obese mothers with high gestational weight gain are at the highest risk of pregnancy complications. Promoting a healthy pre-pregnancy BMI and gestational weight gain may reduce the burden of pregnancy complications and ultimately the risk of maternal and neonatal morbidity.
  • Lahti-Pulkkinen, Marius; Bhattacharya, Sohinee; Räikkönen, Katri; Osmond, Clive; Norman, Jane E.; Reynolds, Rebecca M. (2018)
    While previous studies have shown intergenerational transmission of birth weight from mother to child, whether the continuity persists across 3 generations has rarely been assessed. We used the Aberdeen Maternity and Neonatal Data-bank (United Kingdom) to examine the intergenerational correlations of birth weight, birth weight adjusted for gestational age and sex, and small- and large-for-gestational-age births across 3 generations among 1,457 grandmother-mother-child triads. All participants were born between 1950 and 2015. The intergenerational transmission was examined with linear regression analyses. We found that grandmaternal birth weight was associated with grandchild birth weight, independently of prenatal and sociodemographic covariates and maternal birth weight (B = 0.12 standard deviation units, 95% confidence interval: 0.07, 0.18). Similar intergenerational continuity was found for birth weight adjusted for sex and gestational age as well as for small-for-gestational-age births. In conclusion, birth weight and fetal growth showed intergenerational continuity across 3 generations. This supports the hypothesis that the developmental origins of birth weight and hence later health and disease are already present in earlier generations.
  • van der Zwan, Judith Esi; de Vente, Wieke; Tolvanen, Mimmi; Karlsson, Hasse; Buil, J. Marieke; Koot, Hans M.; Paavonen, E. Juulia; Polo-Kantola, Paivi; Huizink, Anja C.; Karlsson, Linnea (2017)
    Background: For many women, pregnancy-related sleep disturbances and pregnancy-related anxiety change as pregnancy progresses and both are associated with lower maternal quality of life and less favorable birth outcomes. Thus, the interplay between these two problems across pregnancy is of interest. In addition, psychological resilience may explain individual differences in this association, as it may promote coping with both sleep disturbances and anxiety, and thereby reduce their mutual effects. Therefore, the aim of the current study was to examine whether sleep quality and sleep duration, and changes in sleep are associated with the level of and changes in anxiety during pregnancy. Furthermore, the study tested the moderating effect of resilience on these associations. Methods: At gestational weeks 14, 24, and 34, 532 pregnant women from the FinnBrain Birth Cohort Study in Finland filled out questionnaires on general sleep quality, sleep duration and pregnancy-related anxiety; resilience was assessed in week 14. Results: Parallel process latent growth curve models showed that shorter initial sleep duration predicted a higher initial level of anxiety, and a higher initial anxiety level predicted a faster shortening of sleep duration. Changes in sleep duration and changes in anxiety over the course of pregnancy were not related. The predicted moderating effect of resilience was not found. Conclusions: The results suggested that pregnant women reporting anxiety problems should also be screened for sleeping problems, and vice versa, because women who experienced one of these pregnancy-related problems were also at risk of experiencing or developing the other problem. (C) 2017 Elsevier B.V. All rights reserved.
  • Pesonen, Anu-Katriina; Lahti, Marius; Kuusinen, Tiina; Tuovinen, Soile; Villa, Pia; Hämäläinen, Esa; Laivuori, Hannele; Kajantie, Eero; Räikkönen, Katri (2016)
    Background We investigated whether maternal prenatal emotions are associated with gestational length and birth weight in the large PREDO Study with multiple measurement points of emotions during gestation. Methods Altogether 3376 pregnant women self-assessed their positive affect (PA, Positive and Negative Affect Schedule) and depressive (Center for Epidemiologic Studies Depression Scale, CES-D) and anxiety (Spielberger State Anxiety Scale, STAI) symptoms up to 14 times during gestation. Birth characteristics were derived from the National Birth Register and from medical records. Results One standard deviation (SD) unit higher PA during the third pregnancy trimester was associated with a 0.05 SD unit longer gestational length, whereas one SD unit higher CES-D and STAI scores during the third trimester were associated with 0.04-0.05 SD unit shorter gestational lengths (P-values = 42 weeks), birth weight and fetal growth were not associated with maternal prenatal emotions. Conclusions This study with 14 measurements of maternal emotions during pregnancy show modest effects of prenatal emotions during the third pregnancy trimester, particularly in the weeks close to delivery, on gestational length. From the clinical perspective, the effects were negligible. No associations were detected between prenatal emotions and birth weight.
  • Frayne, Jacqueline; Nguyen, Thinh; Allen, Suzanna; Hauck, Yvonne; Liira, Helena; Vickery, Alistair (2019)
    Purpose This study aims to describe 10 years of antenatal care and outcomes for women with a severe mental illness (SMI). Methods A retrospective cohort study of 420 completed pregnancy records over the last 10 years (2007-2017). Findings were compared to the Western Australian (WA) pregnancy data. Antenatal attendance, demographic, obstetric, neonatal and psychosocial variables were analysed using t tests, chi(2)(,) ANOVA and odds ratio (OR). Results Overall, women with a SMI had high rates of comorbidity (47%), antenatal complications, and preterm birth at 12.6% compared to WA mothers (p <0.001). Those with schizophrenia were at highest risk with increased risk of threatened preterm labour OR 8.25 (95% CI 4.64-14.65), gestational diabetes OR 3.59 (95% CI 2.18-5.91) and reduced likelihood of a spontaneous vaginal birth OR 0.46 (95% CI 0.29-0.71). Late presentation and antenatal attendance for women with SMI were significantly associated with maternal substance use, psychiatric admission during pregnancy, and child welfare involvement. Women with schizophrenia had significantly lower attendance rates at scheduled antenatal care (ANC) appointments than those with bipolar disease (87.1% vs 94%, p = 0.003). Conclusion Obstetric outcomes are poorer for women with SMI compared to the general population. They have higher rates of medical comorbidities, lifestyle and psychosocial risks factors that are known to contribute to poor obstetric outcomes. Effective delivery of regular and appropriate ANC is essential in addressing these multifactorial risks. Targeted strategies addressing comprehensive medical management, preterm birth prevention, lifestyle modifications and increased psychosocial support could improve both short- and long-term outcomes for these women and their children.
  • Rissanen, Annu-Riikka Susanna; Jernman, Riina Maria; Gissler, Mika; Nupponen, Irmeli Katriina; Nuutila, Mika Erkki (2019)
    Background To establish the changes in perinatal morbidity and mortality in twin pregnancies in Finland, a retrospective register research was conducted. Our extensive data from a 28-year study period provide important information on the outcome of twin pregnancies in Finland that has previously not been reported to this extent. Methods All 23,498 twin pregnancies with 46,996 children born in Finland during 1987-2014 were included in the study. Data were gathered from the Medical Birth Register and the Hospital Discharge Register (Finnish Institute for Health and Welfare, Finland) regarding perinatal mortality (PNM) and morbidity. For statistical analysis, binomial regression analysis and crosstabs were performed. The results are expressed in means, percentages and ranges with comparison to singletons when appropriate. Odds ratios from binomial regression analysis are reported. A p-value Results There were 46,363 liveborn and 633 stillborn twins in Finland during 1987-2014. Perinatal mortality decreased markedly, from 45.1 to 6.5 per 1000 for twin A and from 54.1 to 11.9 per 1000 for twin B during the study period. Yet, the PNM difference between twin A and B remained. Early neonatal mortality did not differ between twins, but has decreased in both. Asphyxia, respiratory distress syndrome, need for antibiotics and Neonatal Intensive Care Unit (NICU) stay were markedly more common in twin B. Conclusions In Finland, PNM and early neonatal mortality in twins decreased significantly during 1987-2014 and are nowadays very low. However, twin B still faces more complications. The outline provided may be used to further improve the monitoring and thus perinatal outcome of twins, especially twin B.
  • Björkqvist, Johan; Pesonen, Anu-Katriina; Kuula, Liisa; Matinolli, Hanna-Maria; Lano, Aulikki; Sipola-Leppanen, Marika; Tikanmaki, Marjaana; Wolke, Dieter; Jarvelin, Marjo-Riitta; Eriksson, Johan G.; Andersson, Sture; Vaarasmaki, Marja; Heinonen, Kati; Raikkonen, Katri; Hovi, Petteri; Kajantie, Eero (2018)
    A preference for eveningness (being a "night owl") and preterm birth ( Circadian preference was measured among 594 young adults (mean age 24.3 years, SD 1.3) from two cohorts: the ESTER study and the Arvo Ylppo Longitudinal Study. We compared 83 participants born early preterm (= 37 weeks, n = 346). We also compared very low birth weight (VLBW, There were no consistent differences across the study groups in sleep midpoint. As compared with those born at term, the mean differences in minutes:seconds and 95% confidence intervals for the sleep midpoint were: early preterm weekdays 11:47 (-834 to 32:08), early preterm weekend 4:14 (-19:45 to 28:13), late preterm weekdays -10:28 (-26:16 to 5:21), and late preterm weekend -1:29 (-20:36 to 17:37). There was no difference in sleep timing between VLBW-participants and controls either. The distribution of chronotype in the MEQ among all participants was 12.4% morningness, 65.4% intermediate, and 22.2% eveningness. The distribution of the subjective chronotype class did not differ between the three gestational age groups (p = 0.98). The linear regression models did not show any influence of gestational age group or VLBW status on the MES (all p > 0.5). We found no consistent differences between adults born early or late preterm and those born at term in circadian preference. The earlier circadian preference previously observed in those born smallest is unlikely to extend across the whole range of preterm birth.
  • Tikanmaki, Marjaana; Tammelin, Tuija; Vaarasmaki, Marja; Sipola-Leppänen, Marika; Miettola, Satu; Pouta, Anneli; Jarvelin, Marjo-Riitta; Kajantie, Eero (2017)
    Background: Lower levels of physical activity and cardiorespiratory fitness are key risk factors of chronic adult diseases. Physical activity and cardiorespiratory fitness are predicted by birth weight, but the underlying parental and pregnancy-related factors remain largely unknown. We examined how prenatal determinants are associated with physical activity and cardiorespiratory fitness in adolescence. Methods: Of the 16-year-old members of the population-based Northern Finland Birth Cohort 1986 (NFBC 1986), 6682 singletons with no major physical disability reported their amount of physical activity outside school hours, and 4706 completed a submaximal cycle ergometer test assessing cardiorespiratory fitness. Physical activity was expressed as metabolic equivalent hours per week (METh/week) and cardiorespiratory fitness as peak oxygen uptake (ml center dot kg(-1)center dot min(-1)). Prenatal determinants included birth weight, length of gestation, mother's and father's body mass index (BMI), maternal gestational diabetes mellitus (GDM), and maternal hypertension and smoking during pregnancy. Data were analyzed by multiple linear regression. Results: A higher birth weight and longer length of gestation predicted lower levels of physical activity and cardiorespiratory fitness at 16 years, although the association between length of gestation and physical activity was inverse U-shaped. Mother's or father's overweight or obesity before pregnancy were associated with lower levels of their offspring's physical activity and fitness in adolescence. Adjusting for maternal pregnancy disorders and the adolescent's own BMI attenuated the associations with the mother's but not the father's overweight/obesity. Furthermore, maternal GDM predicted lower cardiorespiratory fitness. Conclusions: A high birth weight and parental overweight/obesity are associated with lower levels of both physical activity and cardiorespiratory fitness in adolescence, while maternal GDM and longer length of gestation are associated with lower cardiorespiratory fitness. Both long and short lengths of gestation predict low physical activity.
  • Schreier, Nadja; Moltchanova, Elena; Forsen, Tom; Kajantie, Eero; Eriksson, Johan G. (2013)
  • Berg, Venla; Miettinen, Anneli; Jokela, Markus; Rotkirch, Anna (2020)
    Birth intervals are a crucial component of fertility behaviour and family planning. Short birth intervals are associated—although not necessarily causally—with negative health-related outcomes, but less is known about their associations with family functioning. Here, the associations between birth intervals and marital stability were investigated by Cox regression using a nationally representative, register-based sample of individuals with two (N = 42,481) or three (N = 22,514) children from contemporary Finland (observation period 1972–2009). Shorter interbirth intervals were associated with an increased risk of parental divorce over a ten-year follow-up. Individuals with birth intervals of up to 1.5 years had 24–49 per cent higher divorce risk compared to individuals whose children were born more than 4 years apart. The pattern was similar in all socioeconomic groups and among individuals with earlier and later entry to parenthood. Our results add to the growing body of research showing associations between short birth intervals and negative outcomes in health and family functioning.
  • LifeCycle Project Group; Pinot de Moira, Angela; Haakma, Sido; Strandberg-Larsen, Katrine; Eriksson, Johan G.; Mikkola, Tuija M.; Nybo Andersen, Anne-Marie (2021)
    The Horizon2020 LifeCycle Project is a cross-cohort collaboration which brings together data from multiple birth cohorts from across Europe and Australia to facilitate studies on the influence of early-life exposures on later health outcomes. A major product of this collaboration has been the establishment of a FAIR (findable, accessible, interoperable and reusable) data resource known as the EU Child Cohort Network. Here we focus on the EU Child Cohort Network’s core variables. These are a set of basic variables, derivable by the majority of participating cohorts and frequently used as covariates or exposures in lifecourse research. First, we describe the process by which the list of core variables was established. Second, we explain the protocol according to which these variables were harmonised in order to make them interoperable. Third, we describe the catalogue developed to ensure that the network’s data are findable and reusable. Finally, we describe the core data, including the proportion of variables harmonised by each cohort and the number of children for whom harmonised core data are available. EU Child Cohort Network data will be analysed using a federated analysis platform, removing the need to physically transfer data and thus making the data more accessible to researchers. The network will add value to participating cohorts by increasing statistical power and exposure heterogeneity, as well as facilitating cross-cohort comparisons, cross-validation and replication. Our aim is to motivate other cohorts to join the network and encourage the use of the EU Child Cohort Network by the wider research community.
  • Liu, Xueping; Helenius, Dorte; Skotte, Line; Beaumont, Robin N.; Wielscher, Matthias; Geller, Frank; Juodakis, Julius; Mahajan, Anubha; Bradfield, Jonathan P.; Lin, Frederick Tj; Vogelezang, Suzanne; Bustamante, Mariona; Ahluwalia, Tarunveer S.; Pitkanen, Niina; Wang, Carol A.; Bacelis, Jonas; Borges, Maria C.; Zhang, Ge; Bedell, Bruce A.; Rossi, Robert M.; Skogstrand, Kristin; Peng, Shouneng; Thompson, Wesley K.; Appadurai, Vivek; Lawlor, Debbie A.; Kalliala, Ilkka; Power, Christine; McCarthy, Mark; Boyd, Heather A.; Marazita, Mary L.; Hakonarson, Hakon; Hayes, M. Geoffrey; Scholtens, Denise M.; Rivadeneira, Fernando; Jaddoe, Vincent W. V.; Vinding, Rebecca K.; Bisgaard, Hans; Knight, Bridget A.; Pahkala, Katja; Raitakari, Olli; Helgeland, Oyvind; Johansson, Stefan; Njolstad, Pal R.; Fadista, Joao; Schork, Andrew J.; Nudel, Ron; Miller, Daniel E.; Chen, Xiaoting; Weirauch, Matthew T.; Mortensen, Preben Bo; Borglum, Anders D.; Nordentoft, Merete; Mors, Ole; Hao, Ke; Ryckman, Kelli K.; Hougaard, David M.; Kottyan, Leah C.; Pennell, Craig E.; Lyytikainen, Leo-Pekka; Bonnelykke, Klaus; Vrijheid, Martine; Felix, Janine F.; Lowe, William L.; Grant, Struan Fa; Hypponen, Elina; Jacobsson, Bo; Jarvelin, Marjo-Riitta; Muglia, Louis J.; Murray, Jeffrey C.; Freathy, Rachel M.; Werge, Thomas M.; Melbye, Mads; Buil, Alfonso; Feenstra, Bjarke (2019)
    The duration of pregnancy is influenced by fetal and maternal genetic and non-genetic factors. Here we report a fetal genome-wide association meta-analysis of gestational duration, and early preterm, preterm, and postterm birth in 84,689 infants. One locus on chromosome 2q13 is associated with gestational duration; the association is replicated in 9,291 additional infants (combined P= 3.96 x 10(-14)). Analysis of 15,588 mother-child pairs shows that the association is driven by fetal rather than maternal genotype. Functional experiments show that the lead SNP, rs7594852, alters the binding of the HIC1 transcriptional repressor. Genes at the locus include several interleukin 1 family members with roles in pro-inflammatory pathways that are central to the process of parturition. Further understanding of the underlying mechanisms will be of great public health importance, since giving birth either before or after the window of term gestation is associated with increased morbidity and mortality.