Table 1. Prevalence of HBsAg by age group in 1276 pregnant women in the district of Tokombéré.

Variable	HBs Ag
	n positive/n tested (%)	RR (95% CI)*	P value
Age range (yr)
< 20	74/335 (22.1%)	1
20–23	60/330 (18.2%)	0.95 (0.88-1.03)	0.21
24–28	48/278 (17.3%)	0.94 (0.87-1.02)	0.14
> 28	76/324 (23.5%)	1.02 (0.94-1.11)	0.68
All	258/1267 (20.4%)

* risk ratio and 95% confidence interval