Nomogram integrating systemic immune-inflammation index and blood lipid ratio to predict postoperative gastrointestinal dysfunction in elderly gallstone patients

Table 1 Comparison of baseline clinical characteristics between the modeling cohort and the model validation cohort, mean ± SD/n (%)

Indicator		Modeling cohort (n = 86)	Model validation cohort (n = 37)	t/χ2	P value
Age (years)		69.62 ± 6.65	69.24 ± 5.66	0.3031	0.762
Gender	Female	54 (62.79)	26 (70.27)	0.6362	0.425
	Male	32 (37.21)	11 (29.73)
Body mass index	< 18.5 kg/m2	26 (30.23)	13 (35.14)	0.3622	0.834
	18.5-24.0 kg/m2	33 (38.37)	14 (37.84)
	> 24.0 kg/m2	27 (31.40)	10 (27.03)
History of alcohol consumption		45 (52.33)	19 (51.35)	0.0102	0.921
Breakfast habit		44 (51.16)	21 (56.76)	0.3252	0.569
Exercise habit		49 (56.98)	17 (45.95)	1.2662	0.261
Stone diameter	≤ 1 cm	48 (55.81)	19 (51.35)	0.1612	0.698
	> 1 cm	38 (44.19)	18 (48.65)
Stone number	1 stone	52 (60.47)	17 (45.95)	2.2142	0.137
	> 3 stone	34 (39.53)	20 (54.05)
TC (mmol/L)		5.03 ± 0.33	5.10 ± 0.311	1.1721	0.244
HDL-C (mmol/L)		1.31 ± 0.15	1.33 ± 0.15	0.8091	0.420
SII		493.75 ± 84.19	483.71 ± 42.35	0.6881	0.493
TC/HDL-C		3.93 ± 0.75	3.90 ± 0.60	0.1991	0.843
Gallbladder wall thickness	> 5 mm	34 (39.53)	15 (40.54)	16.3982	0.089
	≤ 5 mm	52 (60.47)	22 (59.46)
Operation time (minutes)		34.92 ± 6.99	36.84 ± 6.35	1.4341	0.154
Neutrophil count (× 109/L)		3.98 ± 0.62	3.79 ± 0.58	1.5891	0.115
Lymphocyte count (× 109/L)		1.49 ± 0.41	1.36 ± 0.45	1.5661	0.120
Platelet count (× 109/L)		198.46 ± 32.93	199.67 ± 35.82	0.1821	0.856
TG (mmol/L)		1.32 ± 0.17	1.39 ± 0.23	1.8751	0.063
LDL-C (mmol/L)		2.89 ± 0.35	3.02 ± 0.32	1.9371	0.055
Time to ambulation after surgery	< 1 day	53 (61.63)	23 (62.16)	0.0032	0.955
	≥ 1 days	33 (38.37)	14 (37.84)

¹t-test.

²χ² test.

TC: Total cholesterol; HDL-C: High-density lipoprotein cholesterol ratio; SII: Systemic immune-inflammation index; TG: Triglycerides; LDL-C: Low-density lipoprotein cholesterol.