TABLE 2.

Gravidities in vaccinated and unvaccinated study groups, stratified by patient age

Patient age (yr)	Vaccinated group				Unvaccinated groupa
	No. of patients	% of patients with the indicated no. of gravidities			No. of patients	% of patients with the indicated no. of gravidities
		1	2	≥3		1	2	≥3
18–20	4	100.0	0.0	0.0	3	66.7	33.3	0.0
21–25	81	85.2	12.4	2.4	63	84.2	7.9	7.9
26–30	28	50.0	28.6	21.4	33	60.6	30.3	9.1
≥30	9	44.4	44.4	11.2	5	0.0	80.0	20.0
Total	122	74.6	18.0	7.4	104	72.1	19.2	8.7

^aExact probability, P = 0.327.