Table 1 Patient characteristics of patients
Variable | Overall (n = 12,109) | Groups | ||
|---|---|---|---|---|
Failed weaning (n = 842) | Successful weaning (n = 11,267) | SMD | ||
Age, years | 57 (45–66) | 64 (53–72) | 56 (45–66) | 0.441 |
Sex, male | 5,150 (43) | 498 (59) | 4,652 (41) | 0.363 |
Body mass index, kg/m2 | 24.1 (21.8–26.5) | 24.8 (22.7–27.3) | 24.0 (21.8–26.4) | 0.243 |
Comorbidities | ||||
Hypertension | 3,266 (27) | 350 (42) | 2,916 (26) | 0.336 |
Diabetes mellitus | 1,669 (14) | 209 (25) | 1,460 (13) | 0.307 |
Chronic obstructive pulmonary disease | 290 (2) | 43 (5) | 247 (2) | 0.156 |
ASA physical status ≥ III | 1,185 (10) | 170 (20) | 1,015 (9) | 0.321 |
Smoking history within 6 months | 1,342 (11) | 142 (17) | 1,200 (11) | 0.181 |
Preoperative SpO2 < 92% in room air | 189 (2) | 41 (5) | 148 (1) | 0.206 |
Type of surgery, major abdominal surgery* | 5,756 (48) | 629 (75) | 5,127 (46) | 0.625 |
Duration of surgery, min | 124 (92–167) | 155 (114–203) | 122 (91–164) | 0.376 |
Intraoperative fluid infusion, mL | 750 (550–1100) | 1100 (800–1450) | 750 (550–1000) | 0.477 |
Intraoperative transfusion | 246 (2) | 32 (4) | 214 (2) | 0.114 |
Estimated blood loss, mL | 50 (50–150) | 150 (80–250) | 50 (50–150) | 0.421 |
Type of anesthesia | 0.214 | |||
Inhaled anesthesia | 8,956 (74) | 692 (82) | 8,264 (73) | |
Total intravenous anesthesia | 3,153 (26) | 150 (18) | 3,003 (27) | |
NRS pain score at the PACU | 4 (3–5) | 5 (4–5) | 4 (3–5) | 0.347 |
Postoperative nausea and vomiting | 849 (7) | 60 (7) | 789 (7) | 0.005 |
Core temperature at the PACU, ℃ | 36.3 (36.0–36.3) | 36.1 (35.9–36.3) | 36.3 (36.1–36.4) | 0.488 |