Table 2. Features.

All features (89)	Feature set A (42)	Feature set B (20)	Feature set C (23)
Age	•	•	•
Sex	•
Height
Weight
Body mass index	•
ASA classification
Comorbidities
Cardiovascular disease
Hypertension	•
Atrial fibrillation
Coronary artery disease	•
Angina pectoris	•
Congestive heart failure	•
Respiratory disease
Asthma	•
Chronic obstructive pulmonary disease	•
Gastrointestinal disease
Hepatitis	•
Liver cirrhosis	•
Viral carrier	•
Hepatitis B viral infection
Renal disease
Chronic kidney injury	•
End-stage renal disease	•
Endocrine disease
Diabetes mellitus	•
HbA1c
Thyroid disease	•
Neurologic disease
Cerebrovascular disease	•
Cerebral aneurysm	•
Baseline blood pressure
Systolic			•
Mean			•
Diastolic		•	•
Noninvasive blood pressure†
Systolic min		•	•
Systolic max			•
Systolic mean		•	•
Systolic sd		•	•
Mean min		•	•
Mean max			•
Mean mean		•	•
Mean sd	•	•
Diastolic min			•
Diastolic max
Diastolic mean		•	•
Diastolic sd
Heart rate†
min	•
max	•	•
mean		•
Anesthetic drug†
Volume
Propofol min
Propofol max	•	•	•
Propofol mean		•	•
Remifentanil min	•
Remifentanil max		•	•
Remifentanil mean	•	•	•
Plasma concentration
Propofol min
Propofol max	•	•	•
Propofol mean
Remifentanil min
Remifentanil max
Remifentanil mean
Effect-site concentration
Propofol min
Propofol max
Propofol mean
Remifentanil min	•
Remifentanil max
Remifentanil mean			•
Target concentration
Propofol min	•
Propofol max
Propofol mean
Remifentanil min	•
Remifentanil max
Remifentanil mean	•	•
Vasoactive drug administration†
Ephedrine
Ephedrine volume	•
Phenylephrine	•
Phenylephrine volume
Esmolol	•
Esmolol volume
Labetalol	•
Labetalol volume
Mechanical ventilation data†
Tidal volume min	•
Tidal volume max	•	•
Tidal volume mean		•	•
Minute ventilation min
Minute ventilation max	•
Minute ventilation mean
Respiratory rate min	•
Respiratory rate max	•
Respiratory rate mean		•
Max positive airway pressure min	•
Max positive airway pressure max	•
Max positive airway pressure mean	•
Hypotension†
Frequency			•
Duration			•
Average duration	•		•

Initially, 100 features were selected; however, no patients had 11 comorbidities: myocardial infarction, valve disease, hepatitis C viral infection, fatty liver, alcoholic liver disease, autoimmune liver disease, acute kidney injury, myasthenia gravis, morbid obesity, epilepsy, or dementia. Thus, these features were excluded.

^†Features observed between anesthesia induction and tracheal intubation.