TABLE V.

ASSOCIATIONS OF VITAMIN SUPPLEMENT USE WITH THE RISK OF ENDOMETRIAL CANCER, SHANGHAI ENDOMETRIAL CANCER STUDY, 1997–2003

	Cases/controls	OR (95% CI)	p for trend
Vitamin supplement use
Never	940/873	1.0 (ref.)
Ever	264/339	0.7 (0.6–0.9)
Multi vitamin use	179/226	0.7 (0.6–0.9)
Only vitamin C	20/23	0.7 (0.4–1.3)
Only vitamin A	1/0	–
Only vitamin E	56/71	0.8 (0.5–1.1)
Only B vitamins	8/19	0.3 (0.1–0.8)
Duration of any vitamin use (months)
Never	940/873	1.0 (ref.)
≤336	86/97	0.8 (0.6–1.2)
337–840	52/74	0.6 (0.4–0.9)
841–1,680	76/103	0.7 (0.5–0.9)
>1,680	50/65	0.6 (0.4–0.9)	<0.01

Adjusted for age, education, menopausal status, diagnosis of diabetes, alcohol consumption, physical activity, and BMI.