Home environmental characteristics of participating parents (n = 4530).

aSubject’s home located within a distance of 200 meters of a main road or highway.bSubject’s home has been renovated/redecorated since 1 year before pregnancy.cSubject’s home has acquired new furniture since 1 year before pregnancy.dSubject has reported any of the four dampness signs at home: mold spots, damp stains, water damage or condensation on window panels during winter in child’s bedroom.eSubject has seen cockroaches/rats/mosquitoes/flies or has used mosquito-repellent incense/incense in home.fSubject has used mosquito-repellent incense/incense in home.