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Table 1 Baseline characteristics of patients and large flat polyps

From: Frequent co-occurrence of high-grade dysplasia in large flat colonic polyps (>20 mm) and synchronous polyps

Characteristic Number of patients
Number of patients 802
Age, mean ± SD (range), y 65.4 ± 10.5 (31–92)
Female, no. (%) 321 (40)
Polyp size, mean ± SD (range), mm 34.1 ± 16.1 (20–150)
Polyp location, no. (% of total)  
Caecum 187 (23.3)
Ascending colon 150 (18.7)
Hepatic flexure 71 (8.9)
Transverse colon 79 (9.9)
Splenic flexure 13 (1.6)
Descending colon 40 (5.0)
Sigmoid colon 82 (10.2)
Rectum 180 (22.4)
Histology, no. (% of total)  
Tubular adenoma 254 (31.7)
Tubulovillous adenoma 372 (46.4)
Villous adenoma 9 (1.1)
Adenocarcinoma 90 (11.2)
LGD (without SP with LGD) 421 (52.5)
HGD (without SP with HGD) 214 (26.7)
Serrated polyps 77 (9.6)
Hyperplastic polyps 32 (4)
Sessile serrated adenoma/polyp (SSA/P) without dysplasia 32 (4)
Sessile serrated adenoma/polyp (SSA/P) with LGD 11 (1.37)
Sessile serrated adenoma/polyp (SSA/P) with HGD 2 (0.2)