Table 1 Demographic and clinical characteristics of included patients
|  | Overall (n = 107) | Successful extubation (n = 50) | Unsuccessful extubation (n = 57) | p value |
|---|---|---|---|---|
Age, year | 60 (14) | 59 (13) | 60 (15) | 0.866 |
Male, n (%) | 89 (83.2) | 39 (78.0) | 50 (87.7) | 0.279 |
Body mass index | 23.9 [22.8, 25.9] | 24.2 [22.9, 26.6] | 23.5 [22.7, 25.4] | 0.230 |
APACHE II | 13 [9, 18] | 10 [8, 14] | 15 [11, 20] | 0.001 |
SOFA | 5 [3, 7] | 4 [2, 6] | 6 [4, 8] | < 0.001 |
ISS | 17 [14, 25] | 16 [11, 18] | 21 [16, 25] | 0.001 |
GCS | 15 [13, 15] | 15 [14, 15] | 15 [12, 15] | 0.019 |
Richmond Agitation-Sedation Scale | 0.181 | |||
 − 1 | 11 (10.3) | 3 (6.0) | 8 (14.0) |  |
 0 | 67 (62.6) | 30 (60.0) | 37 (64.9) |  |
 1 | 29 (27.1) | 17 (34.0) | 12 (21.1) |  |
C-spine injury level, n (%) | Â | Â | Â | 0.035 |
 C1 | 6 (5.6) | 2 (4.0) | 4 (7.0) |  |
 C2 | 10 (9.3) | 1 (2.0) | 9 (15.8) |  |
 C3 | 31 (29.0) | 12 (24.0) | 19 (33.3) |  |
 C4 | 18 (16.8) | 9 (18.0) | 9 (15.8) |  |
 C5 | 18 (16.8) | 12 (24.0) | 6 (10.5) |  |
 C6 | 12 (11.2) | 5 (10.0) | 7 (12.3) |  |
 C7 | 12 (11.2) | 9 (18.0) | 3 (5.3) |  |
 C1–C4, n (%) | 65 (60.7) | 24 (48.0) | 41 (71.9) | 0.020 |
ASIA grade, n (%) |  |  |  |  < 0.001 |
 A | 16 (15.0) | 5 (10.0) | 11 (19.3) |  |
 B | 32 (29.9) | 7 (14.0) | 25 (43.9) |  |
 C | 49 (45.8) | 28 (56.0) | 21 (36.8) |  |
 D | 10 (9.3) | 10 (20.0) | 0 (0.0) |  |
ASIA A + B, n (%) | 48 (44.9) | 12 (24.0) | 36 (63.2) |  < 0.001 |
Cause of injury, n (%) | Â | Â | Â | 0.563 |
 Falling | 42 (39.3) | 17 (34.0) | 25 (43.9) |  |
 Motor vehicle collision | 52 (48.6) | 26 (52.0) | 26 (45.6) |  |
 Other | 13 (21.1) | 7 (14.0) | 6 (10.5) |  |
Surgical intervention, n (%) | 99 (92.5) | 49 (98.0) | 50 (87.7) | 0.099 |
Comorbidity, n (%) | ||||
 Cardiovascular system | 39 (36.4) | 17 (34.0) | 22 (38.6) | 0.771 |
 Respiratory system | 0 (0.0) | 0 (0.0) | 0 (0.0) | − |
 Neurological system | 9 (8.4) | 3 (6.0) | 6 (10.5) | 0.622 |
 Endocrine system | 14 (13.1) | 5 (10.0) | 9 (15.8) | 0.549 |
 Digestive system | 5 (4.7) | 4 (8.0) | 1 (1.8) | 0.285 |
 Immune dysfunction | 5 (4.7) | 2 (4.0) | 3 (5.3) | 1.000 |