Table 1.

Results of case-control study (n = 60, 20 virologically confirmed cases, 40 controls without signs or symptoms of mumps). Two controls were matched to each virologically confirmed case, matched for age, sex, residential status and whether UK or international student.

				Odds ratios (and 95% CIs)
	No MMR vaccine	One dose of MMR vaccine	Two doses of MMR vaccine	No vaccine versus any MMR	No vaccine versus two doses of MMR	One dose of MMR versus two doses of MMR
Cases (n = 20)	9	9	2	0.66 (0.22 to 2.00)	0.52 (0.09 to 3.16)	0.74 (0.12 to 4.40)
Controls (n = 40)	14	20	6	–	–	–