作者: Svend Juul , Wilfried Karmaus , Jørn Olsen , None
关键词: Geography 、 Environmental protection 、 Fecundity 、 Population study 、 Geographic difference 、 German 、 Demography 、 Pregnancy rate 、 Pregnancy 、 Body mass index 、 Fertility
摘要: … pregnancy-based surveys, using highly structured questionnaires. In this report we present findings on time to pregnancy … proportion of pregnancies occurring up to a given waiting time. …