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Table 2 Baseline characteristics of patients in each trial included in the analysis

From: Can body mass index predict clinical outcomes for patients with acute lung injury/acute respiratory distress syndrome? A meta-analysis

Author (year) BMI (kg/m2) categories Age, years, median (SD) Male, n (%) APACHE III, median score (SD) SAPS II probability of survival, % (SD) Diabetes mellitus, n (%) Liver disease, n (%) Smoking, n (%)
O’Brien 2006 [17] Underweight 62.4 (16.2) 41 (46.6%) NR 0.53 (0.29) 10 (11.4%) NR NR
  Normal 61.0 (17.8) 307 (56.4%) 0.58 (0.28) 87 (16.0%)
  Overweight 59.4 (16.7) 223 (55.9%) 0.59 (0.29) 98 (24.6%)
  Obese 58.0 (16.3) 152 (46.6%) 0.59 (0.28) 113 (34.7%)
  Morbidly obese 53.6 (14.9) 44 (33.6%) 0.68 (0.29) 52 (39.7%)
Morris 2007 [21] Underweight 64.7 (18.4) 28 (56.0%) 82.3 (31.5) NR NR NR NR
  Normal 61.5 (18.1) 195 (64.8%) 74.9 (29.2)
  Overweight 58.9 (17.4) 157 (66.2%) 74.9 (30.0)
  Obese 57.0 (15.9) 116 (63.4%) 70.3 (29.8)
  Morbidly obese 54.7 (13.9) 26 (48.1%) 75.0 (35.1)
Stapleton 2010 [20] Underweight 50.2 (16.8) 36 (59.0%) 97.2 (35.2) NR 8 (13.1%) NR NR
  Normal 51.6 (17.9) 316 (58.3%) 89.9 (29.8) 64 (11.8)
  Overweight 52.1 (18.3) 267 (64.0%) 87.2 (30.1) 55 (13.2%)
  Obese 51.0 (15.5) 172 (54.6%) 83.7 (30.5) 55 (17.5%)
  Morbidly obese 49.3 (13.1) 23 (31.1%) 81.5 (28.6) 26 (35.1%)
Soto 2012 [19] Underweight 65.3 (17.5) 12 (49.0%) 80.9 (20.1) NR 2 (6.0%) 3 (10.0%) 19 (68.0%)
  Normal 58.8 (18.8) 147 (63.0%) 75.4 (22.5) 23 (10.0%) 18 (8.0%) 142 (71.0%)
  Overweight 59.0 (18.7) 164 (69.0%) 75.7 (25.7) 45 (19.0%) 10 (4.0%) 127 (66.0%)
  Obese 56.7 (16.9) 124 (66.0%) 70.4 (21.1) 50 (27.0%) 14 (7.0%) 107 (66.0%)
  Morbidly obese 50.2 (13.9) 26 (43.0%) 69.1 (21.3) 29 (45.0%) 5 (8.0%) 43 (61.0%)
Gong 2016 [18] Underweight 61 (20.0) 35 (42.0%) 70 (22.0) NR 14 (17.0%) 3 (4.0%) NR
  Normal 63 (18.0) 393 (63.0%) 70 (23.0) 113 (18.0%) 40 (6.0%)
  Overweight 62 (17.0) 421 (70.0%) 69 (24.0) 144 (24.0%) 31 (5.0%)
  Obese 60 (17.0) 209 (57.0%) 68 (22.0) 140 (38.0%) 17 (5.0%)
  Morbidly obese 54 (14.0) 58 (50.0%) 67 (25.0) 52 (45.0%) 8 (7.0%)
  1. BMI body mass index, APACHE Acute Physiology and Chronic Health Evaluation, NR not reported, SAPS Simplified Acute Physiologic Score