Rationale, design, methodology and sample characteristics for the Vietnam pre-conceptual micronutrient supplementation trial (PRECONCEPT): a randomized controlled study

Table 2 Data collection and measurements

Measurements	Pre-pregnancy	Pregnancy			Birth	Post-partum
		6-12 weeks	23-28 weeks	30-36 weeks
Maternal
Demographics, SES status	√
OBGYN history	√
Food frequency questionnaire	√
Helminthic infections	√
Mental health	√	√	√	√		√
Morbidity		√	√	√		√
Periodontitis screening		√	√	√
Workload		√	√	√
Blood pressure	√	√	√	√
Anthropometry	√	√	√	√		√
Hematological measures
Hemoglobin	√	√	√	√		√
Serum ferritin	√	√	√			√
Transferrin receptor	√	√	√			√
Infection indicators (CRP, AGP)	√	√	√			√
Other biological indicators
Vitamin A	√	√	√			√
Blood Glucose		√	√
Urine protein		√	√	√
Fetal development (ultrasound)		√	√	√
Birth information					√
Child measurement
Gestational age					√
Anthropometry					√	√
Hematological measures
Hemoglobin						√
Serum ferritin					√
Transferrin receptor					√
Infant feeding practices						√
Supplement information
Supplement consumption	√	√	√	√
Side effects	√	√	√	√

ISSN: 1471-2458