Table 2. Sun habits, sun bed use, and physical exercise with regard to risk of endometrial cancer: multivariate Cox regression analysis.

	Women with cancer	Women without cancer	HR	95% CI
Data from inclusion 1990–1992
Use of sun beds
No	10 319	112	1.0	Reference
Yes	6947	46	0.7	0.5–0.98
1–3 times per year	2324	18	0.9	0.5–1.5
>3 times per year	4623	28	0.6	0.4–0.9
Sun bathing during summer
No	1240	16	1.0	Reference
Yes	15 985	147	0.8	0.5–1.5
Sunbathing abroad during vacation
No	7671	72	1.0	Reference
Yes	9792	93	1.0	0.7–1.4
Data from follow-up interview 2000–02
No	1007	14	1.0	Reference
A walk 1–2 times a week	6472	59	0.7	0.4–1.3
Strenuous exercise	4058	28	0.5	0.3–1.1

CI=confidence interval; HR=hazard ratio.

COX regression analysis used with adjustment for age, education, marital status, hormone use, and family history of gynaecological cancer.