Table 5.

Severe gastroenteritis by characteristics, during the Campylobacter outbreak in Askøy. Unadjusted and adjusted relative risks (RR) with 95% confidence intervals (CIs)

		Unadjusted		Adjusteda
		RR	CI	RR	CI
Sex
	Male	1.20	0.93—1.6	1.33	1.03—1.72
	Female	Reference		Reference
Age group (years)
	0–4	1.02	0.32—3.22	1.23	0.34—4.41
	5–14	0.38	0.06—2.42	0.35	0.05—2.23
	15–24	0.89	0.59—1.36	0.77	0.50—1.19
	25–34	0.85	0.59—1.22	0.77	0.53—1.12
	35–44	0.54	0.36—0.80	0.53	0.36—0.78
	45–54	Reference		Reference
	55–64	0.67	0.43—1.02	0.63	0.41—0.96
	65–74	0.65	0.37—1.14	0.63	0.36—1.09
	75–84	0.92	0.35—2.42	0.84	0.30—2.37
	≥ 85	NA		NA
Tap water (glasses/day)b
	0	0.83	0.34—2.06	0.75	0.31—1.78
	1–2	0.72	0.48—1.08	0.72	0.48—1.08
	3–5	Reference		Reference
	> 5	1.29	0.98—1.71	1.29	0.97—1.70
Diseases
	None	0.84	0.65—1.10
	Diabetes	1.56	0.89—2.76
	Ulcerative colitis	2.14	0.95—4.81
	Crohn’s disease	1.06	0.19—5.81
	Oesophagitis	1.37	0.86—2.19
	Irritable bowel syndrome	1.26	0.86—1.84
	Celiac disease	0.35	0.05—2.29
	Peptic ulcer	2.00	1.27—3.16	1.73	1.00—3.00
	Anxiety	1.32	0.92—1.89
	Depression	1.51	1.09—2.09	1.62	1.17—2.26
	Rheumatic/inflammatory	0.94	0.56—1.57

^aAdjusted for sex, age, intake of tap water, peptic ulcer and depression

^bAverage daily number of tap water glasses during week before outbreak

NA not applicable