11-year follow-up

The 11-year follow-up of the DNBC children was launched in July 2010 and completed in August 2014. During this period we sent letters to 500 families every week to ask parents and their 11-year old participant to fill in a web-based questionnaire.

The 11-year follow up consisted of 2 questionnaires - one for the mother and one for the child (Club11). It was conducted from July 2010 and ended in August 2014, when the last of our young DNBC participants turned 11. 

Parent Questionnaire 
In the parent questionnaire we asked about:

  • diet
  • sun exposure, RF exposure, chlorine exposure
  • vaccinations
  • housing conditions, (pets, smoking, use of fireplace, candles, moisture in house)
  • handicaps
  • childhood diseases, infections, fractures
  • ISAAC-questionnaires (allergies, wheezy breathing, rash)
  • vision, hearing, diction problems
  • enuresis, circumcision,  brushing of teeth
  • SDQ, social competences
  • height, weight and waist measurement for child, mother and father
  • diseases in family (parets and grandparents: hypertension, arthritis, depression, allergies......)
  • diseases in mother (diabetes, hypertension, asthma, allergies, depression, back problems......) - and treatment
  • migraine and smoking in mother
  • phenotyping of mother (earlobes, curly hear, widow's peak, etc)

See code book for the parent and child questionnaire in the 11-year follow up.

From 1997-2002 The Danish National Birth Cohort collected data from 100.000 pregnant women and their babies across Denmark. The 7-year follow up was conduced from 2005-2010 and the 11-year follow up began soon after.


Last revised 23 April 2018


Danish National Birth Cohort

Inger Kristine Meder

DNBC Secretariat
Tel: + 45 3268 8121