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

Table 2 Comparison of clinical data of patients with and without hypothermia in the training set group

Item	Hypothermia, n = 53	Non-hypothermia, n = 101	Statistical value	P value
Sex			χ2 = 9.210	0.002
Male	20 (37.74)	64 (63.37)
Female	33 (62.26)	37 (36.63)
Age in years	61.11 ± 12.15	57.23 ± 8.71	t = 2.282	0.024
Basal body temperature in °C	36.15 ± 0.28	36.74 ± 0.28	t = 12.423	< 0.001
BMI in kg/m2	23.73 ± 2.71	23.75 ± 3.25	t = 0.038	0.970
Diabetes			χ2 = 1.715	0.190
Yes	4 (7.55)	15 (14.85)
No	49 (92.45)	86 (85.15)
Hypertension			χ2 = 0.498	0.480
Yes	9 (16.98)	22 (21.78)
No	44 (83.02)	79 (78.22)
Smoking			χ2 = 0.077	0.781
Yes	6 (11.32)	13 (12.87)
No	47 (88.68)	88 (87.13)
Drinking			χ2 = 0.442	0.506
Yes	4 (7.55)	11 (10.89)
No	49 (92.45)	90 (89.11)
Operating room temperature in °C	21.12 ± 4.05	22.84 ± 5.02	t = 2.153	0.033
ASA			χ2 = 4.325	0.228
I	3 (5.66)	13 (12.87)
II	43 (81.13)	73 (72.28)
III	6 (11.32)	15 (14.85)
IV	1 (1.89)	0
Mode of anesthesia			χ2 = 0.238	0.625
General anesthesia	23 (43.40)	48 (47.52)
General anesthesia joint board anesthesia	30 (56.60)	53 (52.48)
Duration of anesthesia in min	162.52 ± 75.16	118.63 ± 58.35	t = 4.006	< 0.001
Operation duration in min	141.27 ± 75.11	99.21 ± 56.22	t = 3.916	< 0.001
Intraoperative fluid infusion in mL	1157.12 ± 615.51	793.15 ± 422.17	t = 4.319	< 0.001
Infusion of crystal solution in mL	1046.01 ± 560.12	769.34 ± 389.25	t = 3.585	0.001
Infusion of colloidal solution in mL	103.41 ± 15.06	27.79 ± 7.15	t = 42.274	< 0.001
Pneumoperitoneum flow in L/min	270.51 ± 17.21	187.29 ± 11.19	t = 36.200	< 0.001
Intraoperative blood loss in mL	118.33 ± 33.95	112.79 ± 35.31	t = 0.937	0.350
Hemoglobin in g/L	134.98 ± 20.85	136.58 ± 19.69	t = 0.469	0.639
Platelet as × 109/	208.76 ± 62.16	211.41 ± 59.52	t = 0.259	0.796
Glu in mmol/L	5.14 ± 0.95	5.21 ± 1.06	t = 0.403	0.687
ALT in U/L	26.89 ± 10.41	25.79 ± 10.68	t = 0.612	0.541
AST in U/L	21.27 ± 9.12	20.39 ± 8.97	t = 0.575	0.566

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