The DNBC is one of the world's largest birth cohorts with more than 180.000 participants.

The DNBC is one of the world's largest birth cohorts with more than 180.000 participants.

The researchers have collected data throughout the children's lives. Learn more about the specific data collections in the menu.

The researchers have collected data throughout the children's lives. Learn more about the specific data collections in the menu.

Data are made available as the collections are completed. Next up is our ongoing 25-year-old follow-up which will be ongoing until 2029.

Data are made available as the collections are completed. Next up is our ongoing 25-year-old follow-up which will be ongoing until 2029.

In 2023 the young adults of the DNBC are between 20-26 years old and new data collections are in the pipeline.

In 2023 the young adults of the DNBC are between 20-26 years old and new data collections are in the pipeline.

Data available

Since the completion of the initial 4 computer-assisted telephone interviews the DNCB has expanded the data collection with several data sweeps throughout offspring childhood and youth and also among mothers. 

In this section you will find information about DNBC questionnaires and data available - please see sub-menu (to the left if you are on a PC). 

Enrollments and response rates

Data sweep Invited  Responders  Response rate   Codebook
Enrolments  101,042      
Interview 1       92,892 92% Yes, DK and English
Interview 2       87,802 87% Yes, DK and English
FFQ    72,821 72% pdf of questionnaire
Interview 3    70,292 69% Yes, DK and English
Interview 4     66,764 65% Yes, DK and English
7-year follow-up  91,256  57,282 63% Yes, DK and English
11-year follow-up  90,986  49,963 55% Yes, DK and English
Maternal Follow-up  78,010  43,641 55% Yes, DK and English
14-year follow-up  78,651  36,599 47% English only
Puberty follow-up   22,439  15,819 70% Yes, DK and English
18-year follow-up   89,377  49,963 56%  Yes, DK and English