Table 1.

Rubella virus seronegativity rates and GMTs for primiparous women 9 to 22 years after vaccination in the third grade of junior high school

Time (yr) after vaccination	Age (yr)	Sample size	No. of seronegative women	% Seronegativity (95% CI)	GMT (IU/ml) (95% CI)
9	24	142	11	7.7 (3.3–12.1)	69.9 (57.8–81.9)
10	25	323	24	7.4 (4.6–10.3)	70.3 (62.2–78.4)
11	26	576	30	5.2 (3.4–7.0)	63.6 (58.3–69.0)
12	27	956	65	6.8 (5.2–8.4)	65.6 (60.8–70.4)
13	28	1,445	94	6.5 (5.2–7.8)	66.6 (62.8–70.4)
14	29	1,832	109	5.9 (4.9–7.0)	66.8 (63.5–70.1)
15	30	1,899	119	6.3 (5.2–7.4)	68.1 (64.7–71.6)
16	31	1,983	137	6.9 (5.8–8.0)	68.2 (64.8–71.7)
17	32	1,682	91	5.4 (4.3–6.5)	67.5 (63.9–71.1)
18	33	1,455	95	6.5 (5.3–7.8)	64.0 (60.3–67.8)
19	34	886	74	8.4 (6.5–10.2)	59.3 (54.8–63.7)
20	45	560	42	7.5 (5.3–9.7)	59.7 (54.8–64.6)
21	36	258	17	6.6 (3.6–9.6)	64.4 (56.4–72.4)
22	37	93	9	9.7 (3.7–15.7)	54.8 (46.8–62.9)
Total		14,090	917	6.5 (6.1–6.9)	65.9 (64.7–67.1)