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The Danish National Birth Cohort--its background, structure and aim
1Danish Epidemiology Science Centre, Statens Serum Institut, Copenhagen, Denmark.
Insights
Early life exposures significantly impact long-term health, influencing conditions like cardiovascular disease and cancer. The Danish National Birth Cohort (DNBC) tracks maternal and child health to study these critical developmental periods.
Area of Science:
- Reproductive and Developmental Biology
- Public Health Research
- Environmental Epidemiology
Background:
- The critical window from conception to early childhood is crucial for lifelong health.
- Early-life exposures can contribute to the development of chronic diseases later in life, including cardiovascular morbidity, cancer, mental illnesses, asthma, and allergies.
- These exposures influence fetal development, cell proliferation, and organ function, impacting long-term health trajectories and disease susceptibility.
Purpose of the Study:
- To investigate the long-term health impacts of early-life exposures.
- To establish a large-scale cohort for comprehensive study of gene-environment interactions.
- To leverage national health registries for robust, long-term follow-up of maternal and child health outcomes.
Main Methods:
- Establishment of the Danish National Birth Cohort (DNBC) to recruit 100,000 pregnant women.
- Longitudinal follow-up of offspring for several decades, utilizing unique personal identification numbers for data linkage.
- Data collection via computer-assisted telephone interviews during pregnancy and child follow-ups at 6 and 18 months, supplemented by food frequency questionnaires and biological samples (maternal blood, umbilical cord blood).
Main Results:
- Recruitment of 60,000 pregnant women by August 2000, with data collection initiated in 1996.
- The cohort is designed to support numerous gene-environmental hypothesis testing through case-control analyses.
- The infrastructure allows for detailed reconstruction of exposures during critical developmental periods.
Conclusions:
- The Danish National Birth Cohort provides a powerful resource for studying the developmental origins of health and disease.
- The study design facilitates the investigation of complex gene-environment interactions affecting long-term health.
- This large-scale, longitudinal study is essential for understanding how early-life factors shape future health outcomes.
Background:
It is well known that the time from conception to early childhood has importance for health conditions that reach into later stages of life. Recent research supports this view, and diseases such as cardiovascular morbidity, cancer, mental illnesses, asthma, and allergy may all have component causes that act early in life. Exposures in this period, which influence fetal growth, cell divisions, and organ functioning, may have long-lasting impact on health and disease susceptibility.
Methods:
To investigate these issues the Danish National Birth Cohort (Better health for mother and child) was established. A large cohort of pregnant women with long-term follow-up of the offspring was the obvious choice because many of the exposures of interest cannot be reconstructed with sufficient validity back in time. The study needs to be large, and it is aimed to recruit 100,000 women early in pregnancy, and to continue follow-up for decades. The Nordic countries are better suited for this kind of research than most other countries because of their population-based registers on diseases, demography and social conditions, linkable at the individual level by means of the unique ID-number given to all citizens. Exposure information is mainly collected by computer-assisted telephone interviews with the women twice during pregnancy and when their children are six and 18 months old. Participants are also asked to fill in a self-administered food frequency questionnaire in mid-pregnancy. Furthermore, a biological bank has been set up with blood taken from the mother twice during pregnancy and blood from the umbilical cord taken shortly after birth. Data collection started in 1996 and the project covered all regions in Denmark in 1999. By August 2000. a total of 60,000 pregnant women had been recruited to the study. It is expected that a large number of gene-environmental hypotheses need to be based on case-control analyses within a cohort like this.
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