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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