Table 2. Associations between heat stress and incident kidney disease among men and women working full-time.

Heat stress 2005	Kidney disease		ORs			P-value	95% CI
	No.	%	Crude	Age adj.a	Adj.b
Men (n = 17 402)	177	1.02
Never/Rarely	66	0.88	1	1	1
Sometimes	62	1.03	1.18	1.21	1.19	0.345	0.83–1.69
Often	49	1.26	1.44	1.54*	1.48*	0.045	1.01–2.16
P-trend			0.054	0.025	0.046
Women (n = 20 414)	228	1.12
Never/Rarely	130	1.15	1	1	1
Sometimes	65	1.08	0.94	0.94	0.91	0.548	0.67–1.23
Often	33	1.06	0.92	0.92	0.87	0.471	0.59–1.28
P-trend			0.604	0.606	0.411

(*P-value <0.05) & (**P-value <0.001).

^aAssociations with heat stress and incidence of kidney disease are expressed as age-adjusted odds ratios (ORs).

^bAssociations with heat stress and incidence of kidney disease are expressed as ORs adjusted for explanatory variables: age, alcohol consumption, smoking, body mass index, income, education, job type, and job location.