Table 1.
Baseline characteristics of adults with and without acute kidney injury, stratified by body mass index at study entry. Data presented as n (%) or mean (SD)
| No Acute Kidney Injury (n = 769) | Acute Kidney Injury (n = 769) | |||||||
|---|---|---|---|---|---|---|---|---|
| BMI < 20 | BMI 20–24.9 | BMI 25–29.9 | BMI 30+ | BMI < 20 | BMI 20–24.9 | BMI 25–29.9 | BMI 30+ | |
| n (%) | 21 (2%) | 125 (17%) | 269 (35%) | 354 (46%) | 16 (2%) | 134 (17%) | 223 (30%) | 396 (51%) |
| Age | 65.9 (13.5) | 65.5 (13.9) | 68.4 (12.2) | 63.1 (11.9) | 61.7 (15.1) | 64.3 (16.0) | 65.9 (12.7) | 62.3 (11.2) |
| Women | 14 (67%) | 59 (47%) | 84 (31%) | 167 (47%) | 7 (44%) | 46 (34%) | 49 (22%) | 148 (37%) |
| Race | ||||||||
| White | 19 (90%) | 102 (82%) | 241 (90%) | 291 (82%) | 11 (69%) | 108 (81%) | 181 (81%) | 307 (77%) |
| Black | 2 (10%) | 9 (7%) | 17 (6%) | 50 (14%) | 4 (25%) | 16 (12%) | 27 (12%) | 70 (18%) |
| Other | 0 | 14 (11%) | 11 (4%) | 13 (4%) | 1 (6%) | 10 (7%) | 15 (7%) | 19 (5%) |
| BMI (kg/m2) | 18.4 (1.1) | 23.0 (1.4) | 27.5 (1.4) | 36.3 (6.0) | 18.4 (1.1) | 22.8 (1.4) | 27.3 (1.5) | 37.5 (7.3) |
| eGFR ml/min/1.73m2 | ||||||||
| Pre- admission | ||||||||
| 72 (23) | 71 (24) | 66 (22) | 71 (26) | 74 (29) | 72 (29) | 66 (25) | 66 (25) | |
| 3-month baseline | ||||||||
| 77 (25) | 73 (25) | 70 (24) | 74 (24) | 74 (36) | 70 (31) | 64 (25) | 65 (26) | |
| Diabetes | 3 (5%) | 23 (18%) | 84 (31%) | 161 (45%) | 4 (25%) | 43 (32%) | 87 (39%) | 253 (64%) |
| CVD | 7 (33%) | 46 (37%) | 127 (47%) | 141 (40%) | 5 (31%) | 61 (46%) | 103 (46%) | 203 (51%) |
| CHF | 2 (10%) | 21 (17%) | 46 (17%) | 53 (15%) | 6 (38%) | 29 (22%) | 55 (25%) | 115 (29%) |
| Sepsis | 0 | 4 (3%) | 9 (3%) | 13 (4%) | 2 (13%) | 27 (20%) | 29 (13%) | 60 (15%) |
| ICU | 12 (57%) | 80 (64%) | 176 (65%) | 205 (58%) | 11 (69%) | 104 (78%) | 169 (76%) | 261 (66%) |
| Smoker | ||||||||
| never | 7 (33%) | 47 (38%) | 123 (46%) | 149 (42%) | 4 (25%) | 53 (40%) | 86 (39%) | 165 (41%) |
| former | 9 (43%) | 53 (42%) | 117 (43%) | 166 (47%) | 7 (44%) | 50 (37%) | 105 (47%) | 182 (46%) |
| current | 5 (2%) | 23 (18%) | 27 (10%) | 35 (10%) | 5 (31%) | 31 (23%) | 29 (13%) | 47 (12%) |
| unknown | 0 | 2 (2%) | 2 (1%) | 4 (1%) | 0 | 0 | 3 (1%) | 2 (1%) |
| AKI stage 1 | 15 (94%) | 100 (75%) | 174 (78%) | 264 (67%) | ||||
| AKI stage 2 | 0 | 18 (13%) | 25 (11%) | 75 (19%) | ||||
| AKI stage 3 | 1 (6%) | 16 (12%) | 24 (11%) | 57 (14%) | ||||
AKI acute kidney injury, BMI body mass index, CHF chronic heart failure, CVD cardiovascular disease, eGFR estimated glomerular filtration rate, ICU treated in intensive care unit