Table 1. Attack rate and crude risk ratios for gastroenteritis among conference and hotel venue attendees and personnel, by meals, 8–10 November 2017, County of Halland, Sweden (n = 398 survey respondents).

Date	Exposure	Exposed			Non-exposed			RR	95% CI	p value
		Cases (n)	Total (N)	AR (%)	Cases (n)	Total (N)	AR (%)
8 Nov	Breakfast	11	63	18	72	335	22	0.81	0.46–1.44	0.470
	Coffee break	17	70	24	66	328	20	1.21	0.76–1.92	0.436
	Lunch	24	147	16	59	251	24	0.69	0.45–1.07	0.089
	Afternoon coffee	22	110	20	61	288	21	0.94	0.61–1.46	0.795
	Dinner	26	103	25	57	295	19	1.31	0.87–1.96	0.203
9 Nov	Breakfast	32	127	25	51	271	19	1.34	0.91–1.97	0.144
	Coffee break	65	244	27	18	154	12	2.28	1.41–3.69	0.000
	Lunch	75	301	25	8	97	8	3.02	1.51–6.04	0.000
	Afternoon coffee	54	192	28	29	206	14	2.00	1.33–3.00	0.001
	Dinner	27	93	29	56	305	18	1.58	1.06–2.35	0.027
10 Nov	Breakfast	27	80	34	56	318	18	1.92	1.30–2.83	0.001
	Coffee break	24	68	35	59	330	18	1.97	1.33–2.93	0.001
	Lunch	31	98	32	52	300	17	1.82	1.25–2.67	0.002
	Afternoon coffee	8	25	36	74	373	20	1.81	1.04–3.18	0.054
	Dinner	6	23	26	77	375	21	1.27	0.62–2.60	0.525

AR: attack rate; CI: confidence interval; RR: risk ratio.