Table 2

Data collected at the postdelivery period of the AMCHS

Data variable	Delivery	Visit 1	Visit 2	Visit 3	Visit 4
Data variable	Delivery	30–42 days	6 months	12 months	36 months
Interviews and self-administered questionnaires*		√	√	√	√
Medical records†	√
Anthropometry measurement‡	√	√	√	√	√
Biosample collection
Maternal blood	√
Cord blood	√
Cord tissue	√

Medical records are for antenatal, intrapartum and postpartum events of mothers and infants. Anthropometry is for children. The data of postdelivery period is for children.
*Interviews and self-administered questionnaires focused on the child’s developmental status include food diaries, Food Frequency Questionnaires, intakes of dietary supplements, mothers’ feeding practices, breast milk frequency, Brief Infant Sleep Questionnaire, medical history, medication history and physical activities.
†Medical records include gender of infant, number of gestations, type of delivery, Apgar score, and congenital diseases.
‡Anthropometry measurement includes height, weight, and head circumference.
AMCHS, Anhui Maternal–Child Health Study.