Figure 1.

ALSPAC mother participant flow. ^aThis number of recruited pregnancies does not include 717 women who completed one early pregnancy questionnaire and then experienced a pregnancy loss prior to 23 weeks. A description of these pregnancies (the miscarriage substudy) is provided in the supplementary web-material available as Supplementary Data at IJE online. ^bFor some subsequent data collection, additional women who were recruited ∼5–8 years postnatally were included. The description of these additional recruitments is provided in the accompanying cohort profile of index children.² For obstetric data abstractions and for the earlier questionnaires only the 13 761 women were eligible. Later questionnaires and invites to the Focus on Mothers clinic assessment were sent to some additional women who were recruited 5–8 years postnatally and so the potential denominator for these is somewhat greater than 13 761 and varies for different questionnaires