Effect of screening colonoscopy frequency on colorectal cancer mortality in patients with a family history of colorectal cancer

Table 2 Comparison of oncological indicators between the two groups

	Laparoscopic colectomy group, (n = 63)	Open colectomy group, (n = 41)	t-value	P value
Length of specimen (cm)
Colon cancer	30.1 ± 17.8	23.6 ± 9.3	1.492	0.142
Rectal cancer	19.7 ± 8.6	16.8 ± 4.2	1.364	0.394
Tumor distance from proximal margin (cm)
Colon cancer	12.1 ± 6.4	12.8 ± 6.4	0.885	0.721
Rectal cancer	9.2 ± 4.3	8.9 ± 3.9	0.281	0.770
Tumor distance from distal margin (cm)
Colon cancer	10.1 ± 8.8	7.9 ± 4.0	0.984	0.330
Rectal cancer	6.5 ± 4.5	4.3 ± 1.7	0.148	0.883
Number of resected lymph nodes (n)
Colon cancer	11.1 ± 6.3	12.0 ± 6.0	0.602	0.380
Rectal cancer	9.0 ± 5.3	10.3 ± 5.7	0.148	0.349
Number of positive lymph nodes (n)
Colon cancer	0.7 ± 1.1	0.5 ± 0.7	0.853	0.398
Rectal cancer	1.1 ± 1.7	0.6 ± 1.1	1.446	0.258