Table 3

Relative risks (RR) for associations with ulcerative colitis

		Exposure before the age of 11			Exposure between the age of 11 and 16
		Cases (n=213)	Controls (n=337)		Unadjusted RR (95% CI)	Adjusted^5-150 RR (95% CI)	Cases (n=213)	Controls (n=337)	Unadjusted RR (95% CI)	Adjusted^5-150 RR (95%CI)
Bed shared with other child
Always or sometimes	84	120	1.20 (0.8–1.7)	1.14 (0.8–1.6)	Variable not ascertained
Never	120	205	1.0	1.0	Variable not ascertained
Bedroom shared with other child
Always or sometimes	130	221	0.84 (0.6–1.2)	0.83 (0.6–1.2)	104	172	0.88	0.87
Never	78	112	1.0	1.0	106	155	(0.6–1.3)	(0.6–1.2)
Running hot water
Never or sometimes	75	125	0.94 (0.6–1.4)	0.82 (0.5–1.2)	57	90	1.02 (03–1.5)	0.88 (0.6–1.4)
Always	126	198	1.0	1.0	149	239	1.0	1.0
Fixed bath or shower
Sometimes or never	83	119	1.18 (0.8–1.7)	0.97 (0.6–1.5)	56	80	1.07 (03–1.6)	0.88 (0.6–1.4)
Always	126	213	1.0	1.0	154	247	1.0	1.0
Inside toilet
Sometimes or never	101	148	1.19 (0.8–1.7)	1.06 (03–1.6)	71	106	1.08 (03–1.6)	1.10 (0.5–2.4)
Always	107	186	1.0	1.0	140	226	1.0	1.0
Home shared with other family
Always or sometimes	17	27	0.98 (0.5–1.9)	0.94 (03–1.8)	11	22	0.77 (0.4–1.6)	0.74 (03–1.6)
Never	192	298	1.0	1.0	198	306	1.0	1.0
Central heating installed
Sometimes or never	169	259	1.17 (0.8–1.9)	0.96 (0.6–1.6)	154	224	1.32 (0.9–1.9)	0.96 (0.6–1.6)
Always	40	72	1.0	1.0	55	106	1.0	1.0
Parents owned a car
Sometimes or never	136	220	0.88 (0.6–1.3)	0.68 (0.4–1.0)	125	200	0.93 (03–1.3)	1.38 (0.9–2.1)
Always	73	104	1.0	1.0	86	128	1.0	1.0