Table 3.

Quality of life, mental component summary analyzed by simple regression analyses, as continuous and dichotomized variable according to exposure group ten years after a Giardia lamblia outbreak in Bergen, Norway, in 2004, (N = 1255)

Exposure group	N	Mean/difference	95% CI for mean/difference	P‐value	MCS score below 45
					n	%	OR	95% CI
Neither condition among controls	536	53.4a	52.8 to 54.0	ref	67	12.5	ref	ref
Neither condition among exposed	282	−1.4	−2.5 to −0.2	0.023	50	17.7	1.6	1.0‐2.3
IBS‐only among controls	75	−3.8	−5.8 to −1.8	<0.001	15	20.0	1.7	0.9‐3.3
IBS‐only among exposed	146	−3.6	−5.1 to −2.1	<0.001	33	22.6	2.1	1.3‐3.3
CF‐only among controls	51	−12.3	−14.7 to −10.0	<0.001	30	58.8	9.6	5.2‐17.8
CF‐only among exposed	45	−9.8	−12.2 to −7.3	<0.001	23	51.1	7.6	4.0‐14.4
IBS and CF among controls	19	−10.1	−13.8 to −6.3	<0.001	13	68.4	15.9	5.9‐43.1
IBS and CF among exposed	101	−11.5	−13.3 to −9.8	<0.001	62	61.4	11.4	7.1‐18.4

CF, chronic fatigue; IBS, irritable bowel syndrome; MCS, mental component summary; Ref, reference group.

^aMean in reference group of eight‐category exposure variable.