Table 3.

Immunity rate to rubella as a function of age in pregnant women from Jeddah and the Western region of Saudi Arabia.

Age (years)	Total women tested	Immune women
		Number	% (95% CI)	χ 2 (P)
15–19	703	674	95.9% (94.4–97.3%)
20–29	5880	5386	91.6% (90.9–92.3%)	21.952 (0.0005)
30–39	3294	2994	90.9% (89.9–91.8%)
40–49	374	333	89.0% (85.9–92.2%)
Total	10251∗	9387	91.6% (91.0–92.1%)

95% CI: 95% confidence interval; χ ²: chi-square test.

∗Data from 25 patients were unavailable.