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 | Â | Â | Â | Â |
 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 | Â | Â | Â | Â |
 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 | Â | Â | Â | Â |
 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 | Â | Â | Â | Â |
 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) |