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Table 1 Description of studies included in the analysis

From: The associations of parity and maternal age with small-for-gestational-age, preterm, and neonatal and infant mortality: a meta-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
  1. RCT = randomized controlled trial
  2. LMP = last menstrual period
  3. LBW = low birthweight