Prevalence of advanced colonic polyps in asymptomatic Chinese

Table 1 Baseline characteristics of patients and colonoscopic find-ings

Characteristics	Patients, n (%)
Gender
Female	2 848 (47.7)
Male	3 125 (52.3)
Age (yr)
40-49	2 656 (44.4)
50-59	1 903 (31.9)
60-69	942 (15.8)
70	472 (7.9)
Colonoscopic findings
No polyp	5 002 (83.7)
Proximal polyp	284 (4.8)
Distal polyp	569 (9.5)
Combined	118 (2.0)

Table 2 Prevalence of colorectal polyps in relation to demographic parameters, n (%)

Age group (yr)	Male			Female
	Total no.of cases	Polyps	Advancedpolyps	Total no.of cases	Polyps	Advancedpolyps
40-49	1 348	186 (13.8)	18 (1.3)	1308	103 (7.9)	16 (1.2)
50-59	1 067	217 (20.3)	38 (3.6)	836	104 (12.4)	23 (2.8)
60-69	480	140 (29.2)	40 (8.3)	462	84 (18.2)	19 (4.1)
≥ 70	230	70 (30.4)	28 (12.2)	242	67 (27.7)	17 (7.0)
Total	3 125	613 (19.6)	124 (4.0)	2848	358 (12.6)	75 (2.6)

Table 3 Prevalence of advanced proximal polyps according to distal findings

Distal finding	Total	Advanced proximal polyp	Relative risk
No polyp	5286	56	1.0
Hyperplastic polyp	181	6	3.1 (1.3 - 7.4)
Tubular adenoma	380	11	2.7 (1.4 - 5.3)
Advanced adenoma	126	18	13.5 (5.1 - 35.4)