Table 1.

Population characteristics, by study period

		Control period (n=122 884)	Intervention period (n=95 393)
First visit		37 826 (30·8%)	30 772 (32·3%)
Fourth visit		11 319 (9·2%)	8635 (9·0%)
Other follow-up visits		73 739 (60·0%)	55 986 (58·7%)
First antenatal care visit
	Women screened	37 826	30 772
	Age, years	24·0 (6·1)	24·1 (6·2)
	Gestational age, weeks	22·9 (6·7)	22·4 (6·7)
Follow-up antenatal care visits
Women screened		85 058	64 621
Age, years		23·9 (6·0)	24·0 (6·0)
Gestational age, weeks		30·4 (6·5)	29·6 (6·5)

Data are n (%) or mean (SD).