Table 1.

Study characteristics based on cooking fuel type

Characteristics	High-pollution fuel (N = 9021) % (95 % CI)	Low-pollution fuel (N = 103) % (95 % CI)
Child gender
Male	50.1	52.9
Female	49.9	47.1
Birth order
1	19.9	37.9
2	19.7	35.6
3	17.2	14.3
4+	41.4	12.1
Size at birth
Below average	12.5	8.7
Average+	87.4	91.2
Low birthweight(< 2500g)	10.1	13.5
Maternal education
None	13.2	1.6
Primary	66.7	12.2
Secondary	19.2	46.7
Higher	0.7	39.9
Maternal religion
Christian	86.1	92.1
Non-Christian	14.0	7.8
Wealth Index
1st quintile	18.1	-
2nd quintile	19.6	-
3rd quintile	20.9	-
4th quintile	20.5	0.53
5th quintile	20.8	99.5
Residence
Urban	17.4	90.8
Rural	82.5	9.1
	Mean (standard error)	Mean (standard error)
Maternal age (years)	18.4 (0.1)	22.1 (0.4)
Maternal BMI (kg/m2)	24.4 (0.2)	26.2 (1.4)
Birthweight (g)	3260.3 (72.3)	3286.9 (10.7)

BMI = body mass index