Table 1.

Characteristics of patients who underwent bariatric surgery and hospitals that perform bariatric surgery, 2006–2016

CharacteristicTime Period
2006–2008, n=32,5772009–2013, n=92,2232014–2016, n=76,879
Patients with ESKD
 Patients, no. (%)275 (10)1094 (41)1329 (49)
 Age, yr, mean (SD)46 (11)48 (10)49 (10)
 Men, no. (%)115 (42)453 (41)566 (43)
 White race, no. (%)135 (49)489 (45)612 (46)
 Black race, no. (%)117 (43)493 (45)571 (49
 Comorbidities, mean (SD)3.2 (1)3.9 (1)4.4 (1)
 Comorbidities, median (IQR)3 (2–4)4 (3–5)4 (3–5)
 Prior kidney transplant, no. (%)8 (3)34 (3)45 (3)
 Hospital characteristics
  Hospitals, no.147338474
  No. of beds, no. (% of patients)
   <20040 (15)173 (16)166 (13)
   200–34942 (16)190 (18)295 (23)
   350–49963 (24)252 (23)265 (20)
   ≥500123 (46)465 (43)587 (45)
  Profit status, no. (% of patients)
   Not for profit197 (74)778 (72)893 (68)
   For profit45 (17)222 (21)292 (22)
   Other26 (11)80 (7)128 (10)
  Teaching hospital, no. (% of patients)131 (49)392 (36)474 (36)
  Kidney transplant center, no. (% of patients)136 (50)414 (38)575 (43)
Patients without ESKD
 Patients, no. (%)33,240 (17)91,419 (46)76,445 (38)
 Age, yr, mean (SD)55 (12)556 (12)57 (11)
 Men, no. (%)8520 (26)24,226 (27)19,658 (26)
 White race, no. (%)27,303 (82)72,781 (80)58,819 (77)
 Black race, no. (%)4486 (14)14,138 (16)13,398 (18)
 Comorbidities, mean (SD)2.2 (1.1)2.5 (1.3)2.6 (1.5)
 Comorbidities, median (IQR)2 (1–3)2 (2–3)2 (2–3)
 Prior kidney transplant, no. (%)87 (0.3)267 (0.3)267 (0.4)
Hospital characteristics
  Hospitals, no.8089521191
  No. of beds, no. (% of patients)
   <2007051 (22)18,330 (20)17,258 (23)
   200–3497319 (23)23,004 (25)19,468 (26)
   350–4997384 (23)21,120 (2315,668 (21)
   ≥50010,555 (33)28,689 (32)23,172 (31)
  Profit status, no. (% of patients)
   Not for profit23,049 (71)63,664 (70)52,894 (70)
   For profit5479 (17)18,786 (21)16,535 (22)
   Other3781 (12)8693 (10)6137 (8)
  Teaching hospital, no. (% of patients)10,322 (32)25,159 (28)16,403 (22)
  Kidney transplant center, no. (% of patients)9789 (30)24,428 (27)16,042 (21)
  • P values for all trends across time periods <0.01 when calculated using Spearman rank correlation test. Comorbidities were calculated from the list of 27 Elixhauser categories. IQR, interquartile range.