Table 2.

Multivariable case/non-case exact logistic regression analysis (N=172)

Food item and date served	aOR	(95% CI)	P value
Milk (breakfast, 12 Sept.)	2·80	(0·11–35·36)	0·723
Ham pasta (lunch, 12 Sept.)	10·94*	(1·10–∞)	0·040
Meat ravioli (dinner, 12 Sept.)	3·76*	(0·38–∞)	0·274
Milk (breakfast, 13 Sept.)	1·90	(0·17–47·60)	0·972
Mackerel salad (dinner, 13 Sept.)	2·66*	(0·26–∞)	0·438
Drink (dinner, 13 Sept.)	1·62	(0·23–10·30)	0·835
Egg cress roll (lunch, 14 Sept.)	41·1	(10·28–249·74)	<0·001
Turkey roll (lunch, 15 Sept.)	4·43	(0·21–380·02)	0·596

aOR, Adjusted odds ratio; CI, confidence interval.

^*Median unbiased estimate [26].