Validation of a Prediction Model for Intraoperative Hypothermia in Patients Receiving General Anesthesia

Table 1

Participants’ baseline demographics (N = 227).

Variable	Value
Patient characteristics
Age (years)	49 ± 13
Sex, male	39 (17.2%)
Height (cm)	163.5 ± 6.8
Weight (kg)	65.0 ± 11.0
BMI (kg/m^2)	24.2 ± 3.5
ASA physical status
1	48 (21.1%)
2	158 (69.6%)
3	21 (9.3%)
4	0 (0.0%)
Anesthesia/surgery details
Type of surgery
General surgery	61 (26.9%)
Thoracic surgery	17 (7.5%)
Orthopedics surgery	7 (3.1%)
Urology	16 (7.0%)
Neurosurgery	1 (0.4%)
Gynecology	119 (52.4%)
ENT surgery	5 (2.2%)
Ophthalmology	1 (0.4%)
Magnitude of surgery^a
Minor	0 (0.0%)
Intermediate	8 (3.5%)
Major	80 (35.2%)
Major-plus	139 (61.2%)
Invasiveness of surgery
Minimally invasive surgery^b	99 (43.6%)
Open surgery	128 (56.4%)
Mode of anesthesia
General anesthesia	227 (100.0%)
Duration of anesthesia^c (min, N = 220)	140.5 (108.5–190.0)
Duration of surgery^d (min, N = 220)	107.0 (68.0–149.8)
Blood loss (mL)	50 (0–100)

Data are presented as n/N (% of nonmissing data), mean ± SD, or median (IQR). ASA, American Society of Anesthesiologists; BMI, body mass index; ENT, ear, nose, and throat; IQR, interquartile range; SD, standard deviation. a Magnitude of surgery is categorized as minor surgery (i.e., superficial surgery); intermediate surgery (e.g., excision of varicose vein of leg, laparoscopy, and tonsillectomy); major surgery (e.g., total hysterectomy, laparoscopic cholecystectomy, thyroidectomy, and segmental hepatectomy); and major-plus surgery (e.g., total knee arthroplasty, lung operation, colonic resection, neurosurgery, and cardiac surgery). b Minimally invasive surgery includes laparoscopic surgery, video-assisted thoracic surgery, and others. c Duration of anesthesia is the time from induction to discontinuation of anesthetics. d Duration of surgery is the time from incision to closure.