Table 1.

Characteristics of study cohort, by initial treatment.

Characteristic	SWL (n = 5208)	URS (n = 2645)	URS+L (n = 1505)	p value
Age				<0.001
66–74	3199 (61)	1481 (56)	853 (57)
75–84	1752 (34)	969 (37)	556 (37)
85+	257 (5)	195 (7)	96 (6)
Female	2000 (38)	1085 (41)	525 (35)	<0.001
Race				<0.001
White	4782 (92)	2459 (93)	1383 (92)
Black	236 (5)	131 (5)	60 (4)
Other	190 (4)	55 (2)	62 (4)
Charlson Score				<0.001
0	4143 (80)	1928 (73)	1113 (74)
1	624 (12)	386 (15)	212 (14)
≥2	441 (8)	331 (13)	180 (12)
Median Household Income				<0.001
<$35,000	1273 (24)	668 (25)	289 (19)
$35,000 – 50,000	2890 (56)	1517 (57)	867 (58)
>$50,000	1034 (20)	459 (17)	347 (23)
Education				0.033
<15%	1360 (26)	692 (26)	375 (25)
15 – 25%	2074 (40)	1058 (40)	554 (37)
>25%	1765 (34)	894 (28)	574 (38)