Post-operative computed tomography scan – reliable tool for quality assessment of complete mesocolic excision

Table 3 All colectomies: Comparison between groups A and B

	Group A, median (mean) in mm, (IQR)	Group B, median (mean) in mm, (IQR)	A – B difference, mean in mm ± SD, (95%CI)	Statistics for A – B difference1	P-value
All colectomies, n	29	29	-	-	-
Actual stump	22.63 (25.60), (20.16-31.04)	61.80 (61.27), (45.07-69.87)	-35.66 ±30.83, (21.24-62.26)	χ2 = 27.38, η² = 0.47	< 0.0012
D2PLL	26.00 (25.34), (20.15-30.53)	34.00 (29.13), (11.00-41.10)	-3.79 ±13.98, (-11.90–4.32)	t = -0.936, df = 56	0.353
D2IP, mean ± SD	0.26 ± 12.18	32.14 ± 26.15	-31.88 ± 26.52, (-41.96-21.79)	χ2 = 22.13, η² = 0.38	< 0.0012
Statistics for D2IP, χ2 (df), P	0.005 (1), 0.944	21.77 (1), < 0.001	-	-	-

¹χ² = Kruskal-Wallis test; η² = effect size estimate; t = t-test.

²Reference to RESULTS text. D₂IP: D2 improvement potential, calculated as difference of actual stump; D₂PLL: D2 predicted ligation level; IQR: Interquartile range.