Table 1.

Items in the parental questionnaires for the outcome variables in the BW Study 2010

Outcome variable	Question	Response options (free text)
Child’s sick days	On how many days during the last year of school or kindergarten was your child unable to go to school/kindergarten because they were sick?	Number of days
Visits to a physician	How often during the last year of school or kindergarten did you have to visit a physician because your child was sick?	Number of visits to a physician
Days off work mother/father	If you are employed: On how many days during the last year of school or kindergarten did you have to stay off work because your child was sick?	Father: number of days Mother: number of days