Baseline demographic and clinical characteristics of unmatched and propensity score-matched groups
| Unmatched group | Propensity score-matched group | |||||
|---|---|---|---|---|---|---|
| GVL (n=540) | MAC (n=3501) | p Value | GVL (n=363) | MAC (n=726) | p Value | |
| Age, year (range) | 59 (18–92) | 63 (18–107) | 0.001 | 62 (19–92) | 61 (18–106) | 0.321 |
| Male, n (%) | 337 (62.4) | 2124 (60.7) | 0.441 | 223 (61.4) | 452 (62.3) | 0.791 |
| Body weight, kg (range) | 65 (40–150) | 60 (30–177) | 0.001 | 65 (40–90) | 60 (30–100) | 0.215 |
| Patient type | <0.001 | 0.452 | ||||
| Medical, n (%) | 314 (58.2) | 2710 (77.4) | 251 (69.2) | 518 (71.4) | ||
| Trauma, n (%) | 226 (41.8) | 791 (22.6) | 112 (30.8) | 208 (28.6) | ||
| Difficult evaluation | ||||||
| Look, n (%) | 68 (12.6) | 97 (2.8) | <0.001 | 8 (2.2) | 12 (1.7) | 0.523 |
| Evaluate 3-3-2, n (%) | 90 (16.7) | 379 (10.8) | <0.001 | 35 (9.6) | 62 (8.5) | 0.547 |
| Morbid obesity, n (%) | 9 (1.8) | 38 (1.3) | 0.345 | 0 (0.0) | 4 (0.6) | 0.310 |
| Obstruction, n (%) | 14 (2.6) | 70 (2.0) | 0.369 | 9 (2.5) | 12 (1.7) | 0.350 |
| Neck mobility, n (%) | 111 (20.6) | 333 (9.5) | <0.001 | 39 (10.7) | 63 (8.7) | 0.270 |
| Use of RSI, n (%) | 271 (50.2) | 1172 (33.5) | <0.001 | 152 (41.9) | 315 (43.4) | 0.634 |
| Evaluation failure, n (%) | 50 (9.3) | 580 (16.6) | <0.001 | 43 (11.9) | 65 (9.0) | 0.132 |
| First intubators’ specialty | <0.001 | 0.892 | ||||
| EM, n (%) | 527 (97.6) | 2938 (83.9) | 354 (97.5) | 707 (97.4) | ||
| Others, n (%) | 13 (2.4) | 563 (16.1) | 9 (2.5) | 19 (2.6) | ||
| First intubators’ grade | <0.001 | 0.689 | ||||
| Junior (≤PGY 3), n (%) | 351 (65.0) | 2720 (77.7) | 269 (74.1) | 555 (76.5) | ||
| Senior (PGY 4, 5), n (%) | 124 (23.0) | 708 (20.2) | 90 (24.8) | 163 (22.4) | ||
| Attending, n (%) | 65 (12.0) | 73 (2.1) | 4 (1.1) | 8 (1.1) | ||
| Intubation Difficulty Scale | 1 (0–12) | 2 (0–14) | <0.001 | 1 (0–7) | 1 (0–14) | 0.215 |
| Degree of intubation difficulty | <0.001 | 0.106 | ||||
| Easy (IDS 0), n (%) | 232 (43.0) | 1171 (33.5) | 137 (37.7) | 306 (42.1) | ||
| Slight (IDS 1–5), n (%) | 288 (53.3) | 2070 (59.1) | 213 (58.7) | 381 (52.5) | ||
| Moderate-to-major (IDS>5), n (%) | 20 (3.7) | 260 (7.4) | 13 (3.6) | 39 (5.4) | ||
EM, emergency medicine; GVL, GlideScope video laryngoscope; IDS, Intubation Difficulty Scale; MAC, Macintosh laryngoscope; PGY, postgraduate year; RSI, rapid sequence intubation.