Clinical characteristics of colorectal polyps in patients with non-alcoholic fatty liver disease in high altitude areas

Table 6 Comparative analysis of polyp pathology between two groups of patients, n (%)

	Qinghai NAFLD group (n = 409)	Tianjin NAFLD group (n = 77)	P value
Adenomatous polyps	365 (89.2)	19 (24.7)	< 0.001
Tubular adenomas, low-grade	345 (84.4)	16 (20.8)	< 0.001
Tubular adenomas, high-grade	3 (0.7)	3 (3.9)	0.021
Villous adenomas, low-grade	0 (0)	0 (0)	1
Villous adenomas, high-grade	0 (0)	0 (0)	1
Tubulovillous adenomas, low-grade	14 (3.4)	0 (0)	0.14
Tubulovillous adenomas, high-grade	3 (0.7)	0 (0)	1
Mixed hyperplastic-adenomatous polyps	2 (0.5)	13 (16.9)	< 0.001
Mixed hyperplastic-adenomas, low-grade	2 (0.5)	13 (16.9)	< 0.001
Mixed hyperplastic-adenomas, high-grade	0 (0)	0 (0)	1
Hyperplastic polyps	41 (10)	45 (58.4)	< 0.001
Hamartomas	0 (0)	0 (0)	1
Inflammatory polyps	1 (0.2)	0 (0)	1

¹Due to the zero number of cases, there are cells in the contingency table with excessively low expected frequencies (< 5), which means the assumptions of the χ² test are not met. Therefore, a valid P value could not be obtained.

NAFLD: Non-alcoholic fatty liver disease.