Table 4.

Attack rates and mean child age within day-care centre departments

	Department			Total all departments
	1	2	3
No. of children within department	14	22	25	61
Mean child age within department	1.5	2.9	3.8	3.0
No. of cases within department	7	4	5	16
Attack rate within department	0.50	0.18	0.20	0.26

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