Table 2:

Estimates of vaccine effectiveness for one and two doses of the MMR vaccine by birth cohort (n = 88)

Birth cohort	No. of cases			Vaccine effectiveness, % (95% CI)
	No vaccine	One dose	Two doses	One dose	Two doses
1980–1984	2	6	2	81.6 (0–96.4)	NA*
1985–1989	3	29	4	59.4 (0–86.2)	NA*
1990–1991	2	11	3	76.7 (0–94.6)	88.0 (0–98.6)
1992–1994	1	2	16	49.2 (0–97.4)	66.3 (0–94.7)
1995–2002	1	1	5	76.5 (0–99.7)	83.9 (0–98.2)

Note: CI = confidence interval, MMR = measles–mumps–rubella, NA = not available.

^*Data not shown. Analyses were limited to people who were eligible to receive two doses of MMR vaccine through the routine immunization program.