Living situation / health / ( opinion on ) contacts with general practitioner / ( opinion on ) contacts with factory doctor / ( opinion on ) contacts with cross societies / absenteeism / contacts with controlling doctor / contacts with hospital / contacts with hospital doctors / contacts with fellow patients / opinion on medical and non-medical treatment in hospital / education / courses taken / wishes regarding Dutch educational training / education of children / knowledge of educational system / public nurseries / nursery schools / primary schools / contacts with school / teachers / other parents / additional education / secondary school.Background variables: basic characteristics/ housing situation/ household characteristics/ place of work/ occupation/employment/ income/capital assets/ education