Application value of machine learning models in predicting intraoperative hypothermia in laparoscopic surgery for polytrauma patients

Table 1 Comparison of clinical data

Parameter	Training (n = 154)	Validation (n = 66)	Statistical value	P value
Sex			χ2 = 0.383	0.536
Male	84 (54.55)	33 (50.00)
Female	70 (45.45)	33 (50.00)
Age in years	54.34 ± 11.58	55.87 ± 10.79	t = 0.916	0.361
Basal body temperature in °C	34.05 ± 0.22	34.01 ± 0.29	t = 1.119	0.264
BMI in kg/m2	23.27 ± 2.82	23.65 ± 2.75	t = 0.923	0.357
Diabetes			χ2 = 2.013	0.156
Yes	19 (12.34)	13 (19.70)
No	135 (87.66)	53 (80.30)
Hypertension			χ2 = 2.685	0.101
Yes	31 (20.13)	20 (30.30)
No	123 (79.87)	46 (69.70)
Smoking			χ2 = 2.013	0.156
Yes	19 (12.34)	13 (19.70)
No	135 (87.66)	53 (80.30)
Drinking			χ2 = 2.127	0.145
Yes	15 (9.74)	11 (16.67)
No	139 (90.26)	55 (83.33)
Operating room temperature in °C	21.65 ± 4.16	21.52 ± 4.12	t = 0.213	0.832
ASA			χ2 = 5.034	0.169
I	16 (10.39)	10 (15.15)
II	116 (75.32)	41 (62.12)
III	21 (13.64)	13 (19.70)
IV	1 (0.65)	2 (3.03)
Mode of anesthesia			χ2 = 0.542	0.462
General anesthesia	71 (46.10)	34 (51.52)
General anesthesia joint board anesthesia	83 (53.90)	32 (48.48)
Duration of anesthesia in min	150.48 ± 76.21	139.39 ± 75.97	t = 0.990	0.323
Operation duration in min	127.61 ± 78.16	124.65 ± 75.77	t = 0.260	0.795
Intraoperative fluid infusion in mL	1067.84 ± 616.12	1073.92 ± 610.11	t = 0.067	0.946
Infusion of crystal solution in mL	1050.13 ± 567.08	1041.37 ± 600.42	t = 0.103	0.918
Infusion of colloidal solution in mL	92.68 ± 15.22	91.15 ± 15.14	t = 0.684	0.495
Pneumoperitoneum flow in L/min	261.22 ± 16.13	258.09 ± 15.96	t = 1.323	0.187
Intraoperative blood loss in mL	98.27 ± 35.82	94.18 ± 35.61	t = 0.777	0.438
Hemoglobin in g/L	115.65 ± 18.15	113.74 ± 17.05	t = 0.728	0.467
Platelet as × 109/L	180.88 ± 56.32	176.87 ± 56.76	t = 0.483	0.630
Glu in mmol/L	4.15 ± 0.87	4.25 ± 0.86	t = 0.784	0.434
ALT in U/L	25.58 ± 10.19	27.02 ± 10.12	t = 0.962	0.337
AST in U/L	20.27 ± 8.82	19.18 ± 8.75	t = 0.842	0.401

Data are mean ± standard deviation or n (%). ALT: Alanine aminotransferase; ASA: American society of anesthesiologists; AST: Aspartate aminotransferase; BMI: Body mass index; Glu: Glucose.