Table 4.

Log Binomial regression of preterm birth and fuel types.

Gestational weeks at birth (Preterm)	Crude RR (CI)	Pvalue	Adjusted RR”∗∗”	Pvalue
Fuel types
Gas/electricity/biogas	1		1
Charcoal	1.50 (1.08–2.10)	0.016	1.47 (1.04–2.05)	0.028
Firewood	1.17 (0.82–1.67)	0.363	1.18 (0.83–1.69)	0.341
Maternal malaria at birth
Malaria parasite present	1		1
Yes	1.46 (1.20–1.76)	<0.001	1.46 (1.21–1.77)	<0.001
Parity
First pregnancy	1		1
2–3 pregnancies	0.90 (0.77–1.05)	0.200	0.91 (0.78–1.05)	0.220
4 or more	0.77 (0.61–0.98)	0.038	0.76 (0.59–0.97)	0.027
Number of cooking sessions per day
Once	1		1
Two times	1.74 (1.23–2.45)	0.002	1.68 (1.19–2.35)	0.003
Three times	1.77 (1.22–2.56)	0.003	1.79 (1.24–2.59)	0.002

Model 1- Maternal malaria, kitchen hours, number of people cooked for, number of cooking session per day. RR = relative risk.