Table 4. Multivariable conditional logistic regression of the major risk factors of epithelial ovarian cancer.

Variables	OR	(95% CI)	p-value
Serum vitamin D levels per 10 nmol/L	0.99	0.97–1.00	0.06
Age (years)
<50	1.00	Reference	-
≥50	1.56	0.54–4.51	0.42
Family history of cancer
No	1.00	Reference	-
Yes	5.88	1.05–32.94	0.04
Skin colour
Light	1.00	Reference	-
Black	0.47	0.10–2.18	0.34
Dark brown	0.37	0.11–1.31	0.12

Abbreviations: CI, confidence interval; OR, adjusted odds ratio.