Table 2.
Differences in unadjusted outcomes among BMI categories
| Variable | Underweight (n = 88) | Normal (n = 544) | Overweight (n = 399) | Obese (n = 326) | Severely Obese (n = 131) | p Valuea |
|---|---|---|---|---|---|---|
| Hospital mortality | 48 (54.6%) | 223 (41.0%) | 142 (35.6%) | 99 (30.4%) | 38 (29.0%) | <.001 |
| ICU mortality | 34 (38.6%) | 173 (31.8%) | 122 (30.6%) | 75 (23.0%) | 29 (22.1%) | .0004 |
| Hospital length of stay | 24.6 (20.4) | 24.7 (23.6) | 24.7 (29.3) | 26.9 (23.2) | 26.8 (27.1) | .095 |
| ICU length of stay | 12.0 (10.4) | 11.6 (12.7) | 11.2 (11.7) | 11.9 (11.0) | 14.1 (15.6) | .180 |
| Discharge destination for survivors | .065 | |||||
| Home | 19 (47.5%) | 193 (60.1%) | 150 (58.6%) | 114 (50.2%) | 52 (55.9%) | |
| Extended care facility | 19 (47.5%) | 106 (33.0%) | 81 (31.6%) | 99 (43.6%) | 37 (39.8%) | |
| Other | 2 (5.0%) | 22 (6.85%) | 25 (9.8%) | 14 (6.2%) | 4 (4.3%) |
BMI, body mass index; ICU, intensive care unit.
a
Kruskal-Wallis test for continuous variables; Pearson’s chi-square test for categorical variables. Body mass categories are defined as follows: Underweight BMI, <18.5 kg/m2; Normal BMI, 18.5–24.9 kg/m2; Overweight BMI, 25–29.9 kg/m2; Obese BMI, 30–39.9 kg/m2; Severely Obese BMI, ≥40 kg/m2. Continuous variables are presented as mean (SD). Categorical variables are presented as frequency (%).