Table 4.

Distribution of patient characteristics between surgery groups

CharacteristicsaSurgery Group
Living Donor Nephrectomy (n=4524)Appendectomy (n=200,274)Cholecystectomy (n=255,231)Nephrectomy for Nonmetastatic Carcinoma (n=1314)
Age, n (%)
  18–39 yr2021 (45)109,734 (55)94,642 (37)25 (2)
  40–49 yr1441 (32)42,604 (21)57,319 (22)125 (10)
  50–59 yr827 (18)30,047 (15)54,969 (22)349 (27)
  60–70 yr235 (5)17,889 (9)48,301 (19)815 (62)
Sex, n/n (%)
 Female2365/3861 (61)88,460/186,790 (47)174,551/249,348 (70)471/1299 (36)
 Male1496/3861 (39)174,551/249,348 (53)74,797/249,348 (30)828/1299 (64)
Race/ethnicity, n/n (%)
 White2146/3395 (63)100,430/160,440 (63)123861/222,237 (56)965/1201 (80)
 African American338/3395 (10)9977/160,440 (6)19631/222,237 (9)54/1201 (5)
 Hispanic721/3395 (21)40840/160,440 (25)69347/222,237 (31)134/1201 (11)
 Other190/3395 (6)9193/160,440 (6)9398/222,237 (4)48/1201 (4)
Primary payer, n (%)
 Private2176 (48)128,865 (64)134,665 (53)2176 (54)
 Medicare833 (18)10,273 (5)35,054 (14)462 (35)
 Medicaid127 (3)26,293 (13)49,468 (19)71 (5)
 Other1388 (30)34,778 (17)35,938 (14)75 (6)
Diagnosis at initial hospitalization, n (%)
 Depression 112 (2)6452 (3)15170 (6)72 (5)
 Obesity 107 (2)14,290 (7)44,471 (17)128 (10)
 Hypertension 126 (3)29,917 (15)75,681 (30)639 (49)
 Hypothyroidism 168 (4)6275 (3)15,100 (6)66 (5)
 Chronic pulmonary disorder 177 (4)11,903 (6)26,103 (10)252 (19)
Initial length of stay, n (%)
 <3 d2199 (49)142,349 (71)122,155 (48)166 (13)
 3–4 d2037 (45)35,514 (18)74,826 (29)559 (43)
 >4 d288 (6)22,411 (11)58,249 (23)589 (45)
Proportion of patients with hospitalizations in the year before surgery, n (%)205 (5)11,679 (6)21,194 (8)91 (7)
  • a Percentages are calculated out of all known levels (excluding missing values); data presented as n (%) or n/N (%) in cases in with missing levels; all comparisons between surgery groups statistically significant (P<0.05).