Table 1. Percentage distribution of birth weight and size at birth for some covariates.

Variable	Birth weight	Size of child at birth
	less than 2.5kg	very small	less than average
Mother age at birth
<20	15.4	4.6	14.4
20–34	11.2	3.7	10.8
35–49	14.5	5.3	10.9
Birth order
1	15.0	4.6	14.4
2–3	11.0	3.3	11.1
4–5	11.0	4.4	10.1
6+	13.3	4.2	10.9
Mother smoking
Smoke tobacco	14.0	10.4	15.4
Does not	12.3	4.0	11.5
Mother education
No education	13.3	4.7	12.9
Primary	12.8	4.1	11.8
Secondary	10.2	3.0	8.7
Higher	7.0	2.9	5.5
Wealth index
Poorest	13.5	4.7	12.8
Poor	13.2	4.0	12.7
Rich	12.6	4.4	10.6
Richer	11.8	3.6	11.0
Richest	10.6	3.2	9.9