Table 1.

Characteristics of the study population

		Pregnant women n = 15,123	Non-pregnant women n = 102,564
Age (mean/SD)		30.6 (4.9)	31.1 (9.6)
SES (%)a	High	20.4	14.6
	Middle	46.4	55.0
	Low	32.7	29.8
Urbanisation (%)b	Very rural	49.0	48.8
	Intermediate urban/rural	23.3	21.8
	Very urban	27.2	28.9

^a Missing: 0.5% (pregnant women), 0.6% (non-pregnant women).

^b Missing: 0.5% (pregnant women), 0.5% (non-pregnant women).