Table 1 Baseline variables
Variable | All patients (n = 700) | Overtime work of anesthesiologists | P value | |
|---|---|---|---|---|
No (n = 419) | Yes (n = 281) | |||
Demographics | ||||
Age, years | 74.3 ± 6.8 | 75.0 ± 6.9 | 73.4 ± 6.6 | 0.002 |
Female sex | 277 (39.6) | 181 (43.2) | 96 (34.2) | 0.017 |
Body mass index, kg/m2 | 23.7 ± 3.9 | 23.6 ± 3.9 | 23.8 ± 3.9 | 0.513 |
Education, years | 9.0 (6.0, 12.0) | 9.0 (6.0, 12.0) | 9.0 (6.0, 12.0) | 0.903 |
Preoperative comorbidity | ||||
Previous stroke | 161 (23.0) | 97 (23.2) | 64 (22.8) | 0.908 |
Hypertension | 446 (63.7) | 286 (68.3) | 160 (56.9) | 0.002 |
Coronary heart disease | 232 (33.1) | 148 (35.3) | 84 (29.9) | 0.135 |
Arrhythmia | 131 (18.7) | 80 (19.1) | 51 (18.1) | 0.754 |
COPD | 42 (6.0) | 24 (5.7) | 18 (6.4) | 0.711 |
Asthma | 14 (2.0) | 10 (2.4) | 4 (1.4) | 0.372 |
Diabetes mellitus | 190 (27.1) | 117 (27.9) | 73 (26.0) | 0.571 |
Obesity | 60 (8.6) | 36 (8.6) | 24 (8.5) | 0.974 |
Liver diseasea | 19 (2.7) | 8 (1.9) | 11 (3.9) | 0.110 |
Renal injuryb | 35 (5.0) | 19 (4.5) | 16 (5.7) | 0.490 |
Previous surgery | 398 (56.9) | 248 (59.2) | 150 (53.4) | 0.128 |
Smokingc | 176 (25.1) | 93 (22.2) | 83 (29.5) | 0.028 |
Alcoholismd | 63 (9.0) | 29 (6.9) | 34 (12.1) | 0.019 |
Chronic use of analgesics or benzodiazepines | 61 (8.7) | 39 (9.3) | 22 (7.8) | 0.497 |
Charlson Comorbidity Indexe | 3.0 (2.0, 3.0) | 2.0 (2.0, 3.0) | 3.0 (2.0, 3.0) | 0.146 |
ASA physical status | 0.728 | |||
Class II | 398 (56.9) | 236 (56.3) | 162 (57.7) | |
Class III | 302 (43.1) | 183 (43.7) | 119 (42.3) | |
Preoperative laboratory tests | ||||
Hematocrit < 30% | 106 (15.1) | 66 (15.8) | 40 (14.2) | 0.583 |
Albumin < 30 g/L | 50 (7.1) | 19 (4.5) | 31 (11.0) | 0.001 |
Glucose < 4.0 or > 10.0 mM/L | 57 (8.1) | 35 (8.4) | 22 (7.8) | 0.804 |
Na+ < 135.0 or > 145.0 mM/L | 67 (9.6) | 37 (8.8) | 30 (10.7) | 0.416 |
K+ < 3.5 or > 5.5 mM/L | 73 (10.4) | 44 (10.5) | 29 (10.3) | 0.939 |