Table 1 Related factors used for extubation and midterm recovery time predictor analysis

patient factors (8)

Gender (male/female), Age, Weight (kg), Height (cm), Body mass index (kg/m²),Preoperative body temperature (℃), Underlying diseases (yes/no), Postoperative body temperature (℃)

anesthetic factors (18)

Preoperative atropine (mg), ASA grade (degree1/degree2), Transfusion volume (ml), Fentanyl (μg), Total amount of propofol(mg), Muscle relaxant types (atracurium/cisatracurium), Total amount of remifentanil (μg), Dexmedetomidine usage (yes/no), Ondansetron usage (yes/no), Nalbuphine (mg), Dexamethasone (mg),Tidal volume (ml), End-tidal CO2 (mmHg), Anesthesiologists, Intraoperative atropine (mg), Anesthesia time (min), Extubation time* (min), Postoperative complications** (yes/no)

surgery factors (5)

Timing of surgery (selective/emergency), operation history (yes/no), surgery time (min), surgeons, surgery types

laboratory examination results (56)

Serum potassium (mmol/L), Serum sodium (mmol/L), Serum chlorine (mmol/L), Serum calcium (mmol/L), Serum phosphorus (mmol/L), Total carbon dioxide (mmol/L), Total protein (g/L), Albumin (g/L), Globulin (g/L), ALB, Total bilirubin (μmol/L), Direct bilirubin (μmol/L), Indirect bilirubin (μmol/L), Alanine aminotransferase (U/L), Aspartate aminotransferase (U/L), Glutamyl transpeptidase (U/L), Alkaline phosphatase (U/L), Cholinesterase (U/L), L-lactate dehydrogenase (U/L), α -hydroxybutyrate dehydrogenase (U/L), Creatine kinase (U/L), Creatine kinase isoenzyme MB (U/L), Ureophil (mmol/L), Creatinine (μ mol/L), Uric acid (μ mol/L), Cystine protease inhibitor C (mg/L), Glucose (mmol/L), Fructosamine (mmol/L), Total cholesterol (mmol/L), Triglyceride (mmol/L), High density cholesterol (mmol/L), Low density cholesterol (mmol/L), C-reactive protein (mg/dL), White blood cell count (10^9/L), Neutrophil percentage (%), Lymphocyte percentage (%), Monocyte percentage (%), Eosinophil percentage (%), Basophils percentage (%), Neutrophil absolute value (10^9/L), Lymphocyte absolute value (10^9/L), Monocyte absolute value (10^9/L), Eosinophil absolute value (10^9/L), Basophil absolute value (10^9/L), Red blood cell count (10^12/L), Hemoglobin (g/L), HCT (%), Mean corpuscular volume (fL), Mean corpuscular hemoglobin (pg), Mean corpuscular hemoglobin concentration(g/L), Red blood cell distribution width (%), Platelet count (10^9/L), Platelet ratio (%), Mean platelet volume (fL), Platelet distribution width (%), Urine routine (normal/abnormal)