From: Exposure to cooking fuels and birth weight in Lanzhou, China: a birth cohort study
Fuel type
AGA
SGA
ORa(95 % CI)
Gas
6232
509
1.00
Coal
264
55
1.27(0.90–1.80)
Biomass
88
22
1.22(0.70–2.08)
Electromagnetic
377
56
1.27(0.93–1.74)