Table 3.

Comparison of baseline data between the modeling set and the validation set.

Metric	Divide into groups	Modeling group (n = 151)	Validation group (n = 63)	t/Z/chi-square value	P price
Sex				0.049	0.826
	Woman	79 (52.3)	34 (54.0)
	Man	72 (47.7)	29 (46.0)
Educational level				0.636	0.728
	Junior middle school	17 (11.3)	6 (9.5)
	Senior middle school	105 (69.5)	42 (66.7)
	University	29 (19.2)	15 (23.8)
Payment method of medical expenses				0.17	0.68
	Beijing medical insurance	46 (30.5)	21 (33.3)
	Foreign medical insurance	105 (69.5)	42 (66.7)
Perception of shame				0.974	0.324
	Deny	104 (68.9)	39 (61.9)
	Yes	47 (31.1)	24 (38.1)
Renal cyst				0.846	0.358
	Do not have	136 (90.1)	54 (85.7)
	Have	15 (9.9)	9 (14.3)
Hypertension				3.070	0.080
	Do not have	113 (74.8)	54 (85.7)
	Have	38 (25.2)	9 (14.3)
Hepatic cyst				0.143	0.705
	Do not have	139 (92.1)	57 (90.5)
	Have	12 (7.9)	6 (9.5)
Diabetes mellitus				2.740	0.098
	Do not have	126 (83.4)	58 (92.1)
	Have	25 (16.6)	5 (7.9)
Preoperative urination				1.861	0.172
	Deny	7 (4.6)	6 (9.5)
	Yes	144 (95.4)	57 (90.5)
Use of analgesics				2.837	0.242
	Kay	102 (67.5)	45 (71.4)
	Special resistance	39 (25.8)	17 (27.0)
	Do not have	10 (6.6)	1 (1.6)
History of smoking				0.174	0.677
	Do not have	84 (55.6)	37 (58.7)
	Have	67 (44.4)	26 (41.3)
Marital status				2.472	0.29
	Bereft of one's spouse	8 (5.3)	2 (3.2)
	Unmarried	2 (1.3)	3 (4.8)
	Married	141 (93.4)	58 (92.1)
Age				0.114	0.909
		55.85 ± 11.79	55.65 ± 11.35
Body mass index (BMI)				0.809	0.419
		23.57 ± 3.22	23.95 ± 2.90
Operation time				0.627	0.531
		2.65 ± 1.44	2.52 ± 1.23
Intraoperative infusion				1.729	0.085
		1053.64 ± 346.56	965.08 ± 329.30
Bed rest time (h)				0.158	0.875
		15.76 ± 4.87	15.87 ± 4.09