Perinatal health effects of herbicides exposures in the United States: the Heartland Study, a Midwestern birth cohort study

Table 3 Timing of data collection, review, analysis, and compensation activities

Intervention	Phase 1 (Prenatal/Delivery)
Intervention	0–13 Week OB Visit	14–27 Week OB Visit	28–40 Week OB Visit	Delivery Visit	Post Delivery Visit
Screen/Consent	X	X
Urine Sample	X	X	X
Buccal Sample	X	X	X	X	X
Maternal Pre-Conception Survey	X	X^a	X^a	X^a
Maternal Perceived Stress Survey (PSS)	X	X	X	X
Maternal Food Frequency Questionnaire (FFQ)	X	X	X	X
Paternal Pre-Conception Survey	X	X^a	X^a	X*
Maternal Pregnancy Survey				X	X^a
Child Health Surveys
Chart Review	X	X	X	X	X
Participant Compensation	X	X	X	X	X

Legend: ^aIf not completed during initial visit in which assigned, questionnaires may be administered at subsequent visits

ISSN: 1471-2458