Fig. 2
From: Perspectives on the design and methodology of periconceptional nutrient supplementation trials
Summary outlines of periconceptional nutrition supplement intervention studies. Description of intervention supplements uses investigators’ terminology. Multimicronutrient contents of intervention supplements summarised in Table 3. All intervention regimens are daily unless specified. Regimen details, blinding and duration are outlined in Table 8. Hb: haemoglobin; NTDs: neural tube defects; IDA: iron deficiency anaemia; PTB: pre-term birth; LBW: low birth weight; SB: stillbirth; HC: head circumference; Brackets: reference number