Table. Mumps complications by MMR vaccination status, the Netherlands, December 1, 2009–June 14, 2011*.

Complication	MMR doses received	No. mumps cases	No. (%) cases with complications	OR	aOR†	p value	Adjusted VE,‡ % (95% CI)
Orchitis§	0	86	20 (23)	Ref	Ref	Ref	Ref
	1	48	5 (10)	0.38	0.34	0.05	66 (1 to 88)
	2	338	31 (9)	0.32	0.26	<0.01	74 (49 to 87)
Other complications¶	0	117	1 (1)	Ref	Ref	Ref	Ref
	1	85	1 (1)	1.38	0.88	0.93	12 (–14 to 95)
	2	571	6 (1)	1.23	0.75	0.80	25 (–5 to 91)
Hospitalization	0	130	4 (3)	Ref	Ref	Ref	Ref
	1	83	2 (2)	0.80	0.70	0.69	30 (–312 to 88)
	2	535	6 (1)	0.40	0.43	0.25	57 (–84 to 90)

*Only those for whom complication and vaccination status were known are included; therefore, totals may differ. MMR, mumps, measles, rubella; OR, odds ratio; aOR, adjusted odds ratio; VE, vaccine effectiveness; ref, reference categories.
†OR and VE adjusted for age group (<18, 18−25, >25 y) and sex, except for orchitis, where the OR and VE were adjusted only for age group.
‡VE = 1 – OR where the OR is an approximation of the relative risk.
§Only men ≥12 years of age are included.
¶Includes the following reported complications: pancreatitis (n = 2), meningitis (3), thyroiditis (1), bronchitis (1), high fever and shortness of breath (1).