Table 1. Time since last eligible dose of measles-mumps-rubella (MMR) vaccine to mumps symptom onset, Norway, September 2015–March 2016 (n = 175).

Characteristics of cases	MMR doses	Median (years)	Interquartile range (years)
Time since last eligible dose of MMR vaccine	1,2,3	10	9–12
	2 or 3	10	9–12
Time interval between two doses of MMR vaccine		11	10.8–11.4
Age	First	1	1–2
	Second	12	12–13
	Time of outbreaka	22	21–24

MMR: measles-mumps-rubella.

^aTime of outbreak was 6 September 2015–May 2016.