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Table 5 Associations between type of fuel and risk of LBW by preterm and term births

From: Exposure to cooking fuels and birth weight in Lanzhou, China: a birth cohort study

Fuel types NBW LBW ORa(95 % CI) ORb(95 % CI)
Term     
 Gas 6668 102 1.00 1.00
 Coal 239 10 1.00(0.48–2.09) 0.96(0.46–2.03)
 Biomass 67 7 1.87(0.76–4.62) 1.85(0.72–4.71)
 Electromagnetic 382 9 0.91(0.44–1.89) 0.84(0.40–1.76)
Preterm     
 Gas 297 269 1.00 1.00
 Coal 31 60 1.53(0.88–2.64) 1.26(0.67–2.37)
 Biomass 6 35 5.24(2.03–13.53) 3.43(1.21–9.74)
 Electromagnetic 26 44 1.47(0.84–2.58) 1.38(0.72–2.65)
Moderate preterm     
 Gas 292 205 1.00 1.00
 Coal 30 41 1.34(0.73–2.43) 1.25(0.64–2.41)
 Biomass 6 24 4.32(1.61–11.58) 3.19(1.09–9.39)
 Electromagnetic 25 35 1.58(0.87–2.87) 1.48(0.75–2.93)
Very preterm     
 Gas 5 64 1.00 1.00
 Coal 1 19 0.86(0.06–12.80) 0.85(0.06–12.69)
 Biomass 0 11
 Electromagnetic 1 9 0.41(0.03–5.52) 0.42(0.03–5.83)
  1. aAdjusted for maternal age, education, family income, maternal weight gain, vitamin supplement during pregnancy, preeclampsia, caesarean section, parity, smoking, and ventilation
  2. bAdditional adjustment for gestational week