Hafkamp-de Groen, E.H.D.

asthma asthma symptoms symptom income study children factor association 1.00 age 1 year level health age 3 years household income breathlessnes model tract infections 4 years childhood van rossem l generation r study household postnatal education postnatal factors netherland <0.001 age 4 years tobacco smoke exposure hafkamp-de groen e jongste jc rotterdam child month epidemiol family mother status infection perinatal childhood asthma tract pregnancy risk factors erasmu research report dif ficulties variable age 6 months cohort mid-low v 2000/month income development exposure prevalence atopy community hafkamp-de parent mid-high result generation birth groen fi ndings jongste day-care attendance birth weight questionnaire tobacco group allergy effect erasmus university rotterdam smoke fi rst year rossem dutch indicator