Table 3.

Risk of Endometrial Cancer in Relation to Use of NSAIDs for at Least 6 Months, by Body Mass Index, Western Washington, 2003–2005^a

	Body Mass Index
	<30 kg/m2						≥30 kg/m2
	Cases (N = 214)		Controls (N = 278)		Odds Ratiob	95% Confidence Interval	Cases (N = 184)		Controls (N = 67)		Odds Ratiob	95% Confidence Interval
	No.	%	No.	%			No.	%	No.	%
Never usersc	119	54.09	156	54.93	1.00	Referent	75	39.68	34	47.22	1.00	Referent
Ever users	101	45.91	128	45.07	0.95	0.65, 1.38	114	60.32	38	52.78	1.24	0.68, 2.26
Duration of use, years
Never usersc	119	55.87	156	55.52	1.00	Referent	75	40.98	34	47.89	1.00	Referent
0.5–9.9	63	29.58	92	32.74	0.85	0.56, 1.30	70	38.25	22	33.99	1.34	0.68, 2.64
≥10	31	14.55	33	11.74	1.12	0.63, 1.99	38	20.77	15	21.13	0.90	0.40, 2.01
Time since last use, years
Never usersc	119	55.87	156	55.52	1.00	Referent	75	40.98	34	47.89	1.00	Referent
<5	66	30.99	93	33.10	0.87	0.57, 1.32	76	41.53	29	40.85	1.08	0.57, 2.04
≥5	28	13.15	32	11.39	1.07	0.59, 1.92	32	17.49	8	11.27	1.51	0.58, 3.92

Abbreviation: NSAIDs, nonsteroidal antiinflammatory drugs (including aspirin and all other reported NSAIDs but excluding acetaminophen).

^aNumbers might not add to total because of missing values.

^bAdjusted for age, county of residence, calendar year, body mass index (continuous), and hormone therapy use.

^cNever users of any type of NSAID for more than 5 days per month for at least 6 consecutive months.