| Morbidly obese | Obese | Overweight | Normal | Underweight | p-value | |
| Subjects | 22 (2.0) | 203 (18.9) | 335 (31.1) | 473 (43.8) | 46 (4.3) | |
| PSI class | ||||||
| I–II | 9 (40.9) | 69 (34.0) | 115 (34.3) | 157 (33.2) | 17 (37.0) | 0.9 |
| III | 1 (4.5) | 33 (16.3) | 54 (16.1) | 96 (20.3) | 13 (28.3) | 0.07 |
| IV | 9 (40.9) | 65 (32.0) | 108 (32.2) | 141 (29.8) | 13 (28.3) | 0.8 |
| V | 3 (13.6) | 36 (17.7) | 58 (17.3) | 79 (16.7) | 3 (6.5) | 0.4 |
| CURB-65 class | ||||||
| 0–1 | 8 (36.4) | 81 (39.9) | 135 (40.3) | 204 (43.1) | 23 (50.0) | 0.6 |
| 2 | 6 (27.3) | 50 (24.6) | 83 (24.8) | 129 (27.3) | 10 (21.7) | 0.9 |
| 3–5 | 8 (36.4) | 72 (35.5) | 117 (34.9) | 140 (29.6) | 13 (28.3) | 0.7 |
| Serum albumin g·L−1 | 38 (35–41) | 35 (33–40) | 37 (32–39) | 37 (33–40) | 36 (33–38) | 0.1 |
| C-reactive protein mg·L−1 | 94 (16–268) | 186 (76–316) | 165 (61–266) | 151 (55–300) | 105 (27–207) | 0.04* |
| Sepsis criteria# | 13 (59.1) | 149 (73.4) | 229 (68.4) | 289 (61.1) | 30 (65.2) | 0.02* |
| Time to clinical stability days | 4 (2–5) | 4 (2–7) | 4 (2–7) | 4 (2–7) | 5 (2–8) | 0.8 |
| Requirement for MV/IS | 1 (4.6) | 19 (9.4) | 19 (5.7) | 38 (8.0) | 3 (6.5) | 0.5 |
Data are presented as n (%) or median (interquartile range). PSI: pneumonia severity index; CURB-65: confusion, urea >7 mmol·L−1, respiratory rate ≥30 breaths·min−1, blood pressure <90 mmHg (systolic) ≤60 mmHg (diastolic), age ≥65 years; MV/IS: mechanical ventilation or inotropic support. #: presence of two or more systemic inflammatory response syndrome criteria. *: p<0.05.