Table 4

Aspirin use and nonaspirin NSAID use 4 days or more per week for at least 6 months among 780 cases of epithelial ovarian cancer, 2053 cancer controls, and 2570 noncancer controls^a

Drug and use	Cases	Cancer controls	OR^b (95% CI)	Noncancer controls	OR^b (95% CI)
Aspirin
No	750	1938	Ref.	2430	Ref.
Yes	27	101	0.7 (0.4–1.1)	130	0.8 (0.5–1.2)
Duration 5+ yr	8	51	0.4 (0.2–0.9)	67	0.5 (0.2–1.0)
Nonaspirin NSAIDs
No	763	1971	Ref.	2465	Ref.
Yes	14	72	0.5 (0.3–0.9)	88	0.5 (0.3–0.9)
Duration 5+ yr	3	12	0.4 (0.2–0.9)	15	0.6 (0.2–2.2)

^a Women whose only use began within the year before admission or whose timing of use was unknown are excluded.
^b OR, odds ratio from logistic regressions with terms for age, geography, and interview year.