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Table 2 Distribution of individual potential confounding factors by birthweight

From: An outcome-based definition of low birthweight for births in low- and middle-income countries: a secondary analysis of the WHO global survey on maternal and perinatal health

Birthweight (g) n Gestational age Cesarean section Breech presentation at birth Maternal complicationsa
Mean (SD) (%) (%) (%)
Overall 205,648 38.5 (2.0) 49,964 (24.3) 9099 (4.4) 34,642 (16.9)
<  1500 2072 30.6 (4.1) 38.9 18.6 25.3
1500–1599 602 33.1 (3.2) 32.4 11.1 20.3
1600–1699 521 33.7 (3.1) 39.3 12.1 22.5
1700–1799 811 34.4 (3.0) 35.8 12.1 20.3
1800–1899 973 34.6 (2.9) 35.9 10.4 22.1
1900–1999 1032 35.2 (2.9) 36.7 9.5 23.3
2000–2099 2807 36.7 (2.6) 26.7 7.5 15.7
2100–2199 2165 36.9 (2.5) 29.7 7.3 19.2
2200–2299 3817 37.2 (2.3) 26.2 6.4 15.6
2300–2399 4178 37.6 (2.0) 25.5 5.2 18.2
2400–2499 5628 37.9 (2.0) 25.9 5.5 18.7
2500–3499 181,042 38.8 (1.6) 23.7 3.9 16.6
  1. All variables differed significantly by birthweight categories (p-value < 0.001)
  2. aMaternal complications included chronic hypertension, cardiac disease, renal disease, chronic respiratory condition, diabetes mellitus, malaria, sickle cell anaemia, severe anaemia, pyelonephritis or urinary infection, HIV/AIDS, Thalassemia and other medical conditions