Table 1.
Description of studies included in the analysis
| Country | N | Type of study | Setting | Facility delivery rate | % LBW | Method of gestational age measurement | |
|---|---|---|---|---|---|---|---|
| Asia | India (2000)[25] | 12,936 | RCT of newborn Vitamin A supplementation | Rural | 63 | 33 | LMP |
| Nepal (1999)[26] | 4,130 | Cluster RCT of multiple micronutrient supplementation | Rural | 6 | 39 | LMP | |
| Nepal (2003)[28] | 1,106 | RCT of antenatal micronutrient supplementation | Peri-urban | 53 | 22 | Ultrasound | |
| Nepal (2004)[27] | 23,662 | Cluster RCT of newborn skin-umbilical cord cleansing with chlorhexidine | Rural | 10 | 30 | LMP | |
| Philippines (1983)[29] | 3,080 | Longitudinal Health-nutritional survey of infant feeding patterns | Urban | 34 | 11 | LMP, Ballard | |
| Thai (2001)[30] | 4,245 | Prospective follow-up of birth cohort | Urban | 99 | 8 | Best obstetric estimate (LMP, ultrasound or neonatal assessment) | |
| Africa | Burkina Faso (2004)[31] | 1,373 | RCT of multiple micronutrient supplementation | Rural | 77 | 17 | Ultrasound at recruitment |
| Burkina Faso (2006)[34] | 1,316 | RCT of maternal fortified food supplementation | Rural | 84 | 16 | Ultrasound at recruitment | |
| Tanzania (2001)[32] | 7,752 | RCT of maternal multiple micronutrient supplementation | Urban | 98 | 10 | LMP | |
| Zimbabwe (1997)[33,35] | 14,110 | RCT of postpartum maternal and neonatal Vitamin A supplementation | Urban | 88 | 14 | Capurro | |
| Americas | Brazil (1982)[21] | 5,914 | Prospective cohort study | Urban | 100 | 7 | LMP |
| Brazil (1993)[22] | 5,279 | Prospective cohort study | Urban | 100 | 9 | LMP, Dubowitz | |
| Brazil (2004)[23] | 4,287 | Prospective cohort study | Urban | 100 | 11 | LMP, Dubowitz, ultrasound if available | |
| Peru (1995)[24] | 978 | RCT of maternal zinc supplementation | Urban | 100 | 4 | LMP, clinical indications | |
RCT = randomized controlled trial
LMP = last menstrual period
LBW = low birthweight