Table 1.
Patient characteristics for the total and propensity-matched cohorts
| Variables | Total cohort |
Matched cohort |
||||
|---|---|---|---|---|---|---|
| LMA (n=2374) | ETT (n=4365) | P | LMA (n=2075) | ETT (n=2075) | P | |
| Age (years) | 51.30 (7.22) | 51.30 (7.42) | 1.00 | 51.37 (7.28) | 51.31 (7.44) | 0.82 |
| BMI (kg/m2) | 23.44 (2.50) | 23.49 (2.66) | 0.46 | 23.43 (2.57) | 23.41 (2.56) | 0.78 |
| Duration of anesthesia | 117.40 (38.81) | 124.97 (46.46) | <0.001 | 119.59 (39.53) | 119.33 (38.13) | 0.83 |
| Duration of surgery | 92.86 (37.31) | 97.90 (39.20) | <0.001 | 94.46 (38.25) | 94.23 (35.88) | 0.85 |
| Cumulative working hours | 328.99 (146.61) | 320.12 (145.02) | 0.017 | 324.22 (145.68) | 322.85 (145.86) | 0.76 |
| Year of surgery | ||||||
| 2016 | 315 (13.3) | 583 (13.4) | <0.001 | 304 (14.7) | 289 (13.9) | 0.68 |
| 2017 | 207 (8.7) | 858 (19.7) | 207 (10.0) | 195 (9.4) | ||
| 2018 | 235 (9.9) | 931 (21.3) | 235 (11.3) | 266 (12.8) | ||
| 2019 | 735 (31.0) | 783 (17.9) | 560 (27.0) | 575 (27.7) | ||
| 2020 | 534 (22.5) | 817 (18.7) | 487 (23.5) | 471 (22.7) | ||
| 2021 | 348 (14.7) | 393 (9.0) | 282 (13.6) | 279 (13.4) | ||
| Intraoperative adjuvant analgesics | 823 (34.7) | 993 (22.7) | <0.001 | 595 (28.7) | 626 (30.2) | 0.29 |
| PCA | 1118 (47.1) | 1881 (43.1) | 0.002 | 972 (46.8) | 976 (47.0) | 0.90 |
| Anemia | 134 (5.6) | 211 (4.8) | 0.15 | 114 (5.5) | 115 (5.5) | 0.95 |
| Hypokalemia | 21 (0.9) | 117 (2.7) | <0.001 | 21 (1.0) | 31 (1.5) | 0.16 |
Data are presented as n (%) or mean (SD). Resulted from Chi-square test or independent sample t-test. BMI=Body mass index; PCA=Patient controlled analgesia; LMA=Laryngeal mask airway; ETT=Endotracheal tube; SD=Standard deviation