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Table 3 Patient subgroups defined by different ranges of lung weightsa

From: Computed tomographic assessment of lung weights in trauma patients with early posttraumatic lung dysfunction

Patient subgroups Atelectasis (≤ reference range) Above reference range Consolidation
Definition Mlung ≤1,164 g Mlung >1,164 g Mlung >1,380 g
Number of patientsb 46 (59%) 32 (41%) 17 (22%)
Median agec, yr 45 (32 to 53) 28 (17 to 46) 21 (17 to 48)
Median PaO2/FiO2ns, mmHg 184 (128 to 252) 136 (78 to 238) 132 (68 to 230)
Median Lung Injury Scoree 2.3 (1.6 to 2.6) 2.7 (2.3 to 3.3) 3.0 (2.3 to 3.3)
Median Injury Severity Scorens 34 (29 to 45) 41 (28 to 50) 36 (25 to 50)
Median AIS-T scoreb 4 (4 to 4) 4 (4 to 4) 4 (4 to 4)
Median Thoracic Trauma Severity Scorens 11 (8 to 14) 12 (9 to 15) 12 (11 to 15)
Median Glasgow Coma Scale scoree 14 (10 to 15) 6 (3 to 12) 7 (3 to 15)
Median volume of intravenous fluids ns, ml 2,000 (1,000 to 3,000) 2,000 (1,500 to 2,875) 2,500 (1,500 to 3,000)
Median time to CTns, min 135 (90 to 220) 112 (90 to 177) 131 (103 to 227)
Median ventilator-free daysd 19 (10 to 25) 15 (0 to 19) 15 (0 to 19)
Median ICU-free daysc 14 (2 to 22) 1 (0 to 13) 5 (0 to 14)
Median Vlunge, ml 2,832 (2,226 to 3,669) 3,812 (3,134 to 4,696) 3,696 (3,019 to 4,668)
Median Mlungb, g 899 (787 to 1,048) 1,398 (1,265 to 1,972) 1,930 (1,461 to 2,065)
Median Mnone, % 16 (10 to 25) 34 (18 to 52) 40 (33 to 57)
  1. aAll values are given as medians with interquartile ranges. Atelectasis, patients with lung weights (Mlung) within the reference interval (that is, 584 to 1,164 g) for normal Mlung; above reference, patients with Mlung values exceeding the upper limit of the reference interval (that is, 1,164 g); consolidation, patients with Mlung values exceeding the lower limit of the 95% confidence interval of the mean Mlung values reported for patients with acute lung injury (that is, 1,380 g [10]); PaO2/FiO2, ratio of arterial partial pressure of oxygen to fraction of inspired oxygen; AIS-T, Abbreviated Injury Scale of the Thorax; time to CT, interval between trauma and computed tomography (CT); ventilator-free days, number of days without mechanical ventilation within a period of 28 days; ICU, intensive care unit; ICU-free days, number of days without ICU treatment within a period of 28 days; Vlung, total lung volume; Mlung, total lung mass; Mnon, percentage mass of nonaerated lung compartment (percentage of Mlung value); ns, not significant. bNo statistical test performed. cP < 0.05, dP < 0.001 and eP < 0.01, respectively, for the Kruskal-Wallis test over all groups.