Safety of opening wounds after cold resection of colorectal cancer patients’ intestinal polyps ten mm or larger

Table 1 Comparison of basic data of patients with colorectal cancer between the two groups, n (%)/mean ± SD

Variable	Before IPTW						After IPTW
	Experimental group (n = 110)		Control group (n = 94)	Z/χ²	P value	SMD	Experimental group	Control group	SMD
Age (year)	66.218 ± 9.293		65.596 ± 9.591	Z = -1.117	0.359	0.066	65.948 ± 9.652	65.940 ± 9.551	0.001
Male (%)	81 (73.636)		73 (77.660)	χ² = 0.253	0.615	0.094	76.602	76.518	-0.001
Bowel preparation (%)	19 (17.273)		21 (19.149)	χ² = 0.036	0.597	0.100	18.675	18.431	0.002
Number of CSP polyps	1.555 ± 1.282		1.532 ± 0.758	Z = 1.273	0.2032	0.021	1.514 ± 1.216	1.517 ± 0.732	-0.003
Size of CSP polyps (cm)	1.191 ± 0.381		1.102 ± 0.253	Z = 1.825	0.068	0.276	1.162 ± 0.383	1.147 ± 0.312	0.045
Location of CSP polyps (%)	Left	57 (51.818)	48 (51.064)	χ² = 0.120	0.939	0.050	52.138	51.432	-0.004
	Right	34 (30.909)	28 (29.787)				30.251	30.590
	Rectum	19 (17.273)	18 (19.149)				17.611	17.978

IPTW: Inverse probability of treatment weighting; SMD: Standardized mean difference; CSP: Cold snare polypectomy.

Table 2 Comparison of bleeding outcomes between the two groups of colorectal cancer patients before inverse probability of treatment weighting

Variable	Experimental group	Control group	RD	95%CI	P value
IPPB (%)	0.909	1.064	0.15	-4.03-4.97	1.000
DPPB (%)	0.909	0.000	-0.91	-4.99-3.05	0.461

IPPB: Immediate post-polypectomy bleeding; DPPB: Delayed post-polypectomy bleeding.

Table 3 Comparison of operation between the two groups of colorectal cancer patients before inverse probability of treatment weighting, mean ± SD

Variable	Experimental group	Control group	Z/χ²	Hodges-Lehmann median difference	95%CI	P value
Procedural time	25.309 ± 16.749	29.309 ± 14.973	Z = 2.487	4.00	1.00-8.00	0.013
Procedural cost	4604.753 ± 2564.277	4915.547 ± 2327.799	Z = 2.055	442.04	13.45-845.87	0.03992

Table 4 Comparison of bleeding outcomes between the two groups of colorectal cancer patients after inverse probability of treatment weighting

Variable	OR	95%CI	P value
IPPB	0.761	0.059-8.943	0.814
DPPB	2.454	0.124-361.945	0.562

IPPB: Immediate post-polypectomy bleeding; OR: Odds ratio; DPPB: Delayed post-polypectomy bleeding.

Table 5 Comparison of operation between the two groups of colorectal cancer patients after inverse probability of treatment weighting

Variable	Quantile	Coefficient	Std. error	t value	95%CI	P value
Procedural time	0.25	-3.662	2.146	-1.706	-8.000 to -0.000	0.088
	0.5	-5.000	3.257	-1.535	-10.000 to 2.520	0.125
	0.75	-3.997	2.933	-1.363	-8.576 to 3.521	0.173
Procedural cost	0.25	-382.282	181.332	-2.108	-821.976 to -19.902	0.035
	0.5	-408.157	282.499	-1.445	-1164.250 to -19.521	0.149
	0.75	-118.185	427.261	-0.277	-952.260 to 880.374	0.782