Abstract
Objective:
To estimate the associations between maternal pre-pregnancy body mass index (BMI) or gestational weight change (GWC) during pregnancy and offspring BMI at 3 years of age, while taking several pre-and postnatal factors into account.
Design:
The Norwegian Mother and Child Cohort Study is a population-based pregnancy cohort study of women recruited from all geographical areas of Norway.
Subjects:
The study includes 31 169 women enrolled between 2000 and 2009 through a postal invitation sent to women at 17–18 weeks of gestation. Data collected from 5898 of the fathers were included.
Main outcome mesures:
Offspring BMI at 3 years was the main outcome measured in this study.
Results:
Mean maternal pre-pregnancy BMI was 24.0 kg m−2 (s.d. 4.1), mean GWC in the first 30 weeks of gestation was 9.0 kg (s.d. 4.1) and mean offspring BMI at 3 years of age was 16.1 kg m−2 (s.d. 1.5). Both maternal pre-pregnancy BMI and GWC were positively associated with mean offspring BMI at 3 years of age. Pre-pregnancy BMI and GWC also interacted, and the strength of the interaction between these two factors was strongly associated with the increase in offspring BMI among mothers who gained the most weight during pregnancy and had the highest pre-pregnancy BMI. Our findings show that results could be biased by not including pre-pregnant paternal BMI.
Conclusion(s):
This large population-based study showed that both maternal pre-pregnancy BMI and GWC were positively associated with mean offspring BMI at 3 years of age.
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Acknowledgements
The provision of questionnaire data by the Norwegian Mother and Child Cohort Study are gratefully appreciated. We thank M Mattingsdal for preparing Figure 2. The Norwegian Mother and Child Cohort Study is supported by the Norwegian Ministry of Health, NIH/NIEHS (Grant no. NO1-ES-85433), NIH/NINDS (Grant no. 1 UO1 NS 047537-01) and the Norwegian Research Council/ FUGE (Grant no. 151918/S10). We are grateful to all participating families in Norway who take part in this ongoing cohort study. In addition, this study was supported by a research grant from South-Eastern Norway Regional Health Authority and Sorlandet Hospital HF. The authors work was independent of these funding sources.
Details of ethics approval
MoBa has been approved by the Norwegian Regional Committee for Ethics in Medical Research and the Data Inspectorate. Informed consent was obtained from each participant before inclusion. The approval from the Data Inspectorate was obtained in September (2003-ref 01/4325)
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Stamnes Køpp, U., Dahl-Jørgensen, K., Stigum, H. et al. The associations between maternal pre-pregnancy body mass index or gestational weight change during pregnancy and body mass index of the child at 3 years of age. Int J Obes 36, 1325–1331 (2012). https://doi.org/10.1038/ijo.2012.140
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DOI: https://doi.org/10.1038/ijo.2012.140
Keywords
- pre-pregnancy body mass index
- gestational weight change
- birth weight
- offspring BMI
- paternal BMI
- Norwegian mother and child cohort
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