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Table 2 Characteristics of large flat polyps for histological subtypes

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

  Histology (total = 802)  
Variable SP LGD HGD adenocarcinoma p value
Patients, no. (% of total) 77 (9.6) 421 (52.5) 214 (26.7) 90 (11.2)  
Female, no. (% of group with specific histology) 29 (37.7) 171 (40.6) 86 (40.2) 35 (38.9) 0.97
Age, mean ± SD (range), y 59.4 ± 11 (41–87) 65.6 ± 10.3 (31–92) 67 ± 9.6 (38–92) 65.7 ± 11.6 (41–91) <0.0001
Polyp size, mean ± SD (range), mm 25.6 ± 8.4 (20–70) 31.4 ± 13.8 (20–150) 38.9 ± 15.9 (20–110) 42.5 ± 23.3 (20–126) <0.0001
Location      
Proximal colon, no. (% of group with specific histology) 62 (80.5) 286 (67.9) 114 (53.3) 25 (27.8) <0.0001
Distal colon, no. (% of group with specific histology) 15 (19.5) 135 (32.1) 100 (46.7) 65 (72.2)