Table 3.

Case attack rates within age groups

	Age (years)					Total all age groups
	1	2	3	4	5
No. of children within age group	10	14	13	16	8	61
No. of cases within age group	4	5	5	2	0	16
Attack rate within age group	0.40	0.36	0.38	0.13	0	0.26

STEC O145 outbreak in child day-care centre Norway, 2009 (n = 16).