Table 2.

Multivariable logistic regression models evaluating predictors of deferred therapy among the entire cohort and predictors of partial nephrectomy among patients receiving surgery for patients ≥65 years of age with T1a renal cell carcinoma, SEER-Medicare 1995–2007.

		Predictors of Deferred Therapy			Predictors of Partial Nephrectomy
Variable		OR^a	(95% CI)	p-value	OR^a	(95% CI)	p-value
Race	White	Ref	-		Ref	-
	Black	1.95	(1.52–2.51)	<0.01	1.15	(0.93–1.42)	0.203

Sex	Male	Ref	-		Ref	-
	Female	0.87	(0.73–1.04)	0.135	0.84	(0.74–0.96)	<0.01

Age	65–69	Ref	-		Ref	-
	70–74	1.21	(0.92–1.57)	0.169	0.88	(0.75–1.02)	0.093
	75–79	1.55	(1.19–2.02)	<0.01	0.77	(0.66–0.91)	<0.01
	80–84	2.76	(2.09–3.64)	<0.01	0.64	(0.52–0.79)	<0.01
	>85	10.36	(7.70–13.93)	<0.01	0.32	(0.22–0.48)	<0.01

Residence	Large Metro	Ref	-		Ref	-
	Metro	0.85	(0.69–1.04)	0.124	0.87	(0.76–1.00)	0.052
	Urban	0.84	(0.57–1.23)	0.361	0.78	(0.59–1.02)	0.068
	Less Urban	1.17	(0.85–1.61)	0.327	0.8	(0.63–1.02)	0.074
	Rural	1.38	(0.71–2.67)	0.341	0.78	(0.46–1.33)	0.367

Marital Status	Married	Ref	-		Ref	-
	Not Married	1.43	(1.19–1.72)	<0.01	0.95	(0.83–1.09)	0.45

CCI^b	0	Ref	-		Ref	-
	1	1.83	(1.49–2.23)	<0.01	0.94	(0.82–1.08)	0.382
	2	2.23	(1.73–2.86)	<0.01	1.03	(0.85–1.26)	0.757
	3	2.53	(1.78–3.62)	<0.01	1.13	(0.83–1.54)	0.453
	4+	3.29	(2.33–4.63)	<0.01	0.69	(0.49–0.98)	0.036

Tumor Size	<2 cm	Ref	-		Ref	-
	2–<3cm	0.84	(0.66–1.08)	0.181	0.67	(0.57–0.79)	<0.01
	3–≤4 cm	0.72	(0.57–0.91)	<0.01	0.29	(0.24–0.34)	<0.01

Year	Since 1995	1.03	(1.00–1.06)	0.024	1.15	(1.12–1.17)	<0.01

Logistic regression adjusted for age, sex, race, residence, marital status, Charlson comorbidity index, tumor size, and year of diagnosis

CCI: Charlson comorbidity index