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Table 4 Comparison of the mean operation time by tumor size, location, and depth

From: Endoscopic submucosal dissection of esophageal granular cell tumor

 

Classification

Number

Time cost (mean ± deviation) minutes

P-value

Size

Small tumor (≤10 mm)

8

31.9 ± 5.9

0.005

Large tumor (>10 mm)

6

46.7 ± 8.2

Location in the esophagus

Distal part (>32 cm)

8

40.6 ± 10.5

0.316

Proximal part (≤32 cm)

6

35.0 ± 9.5

Depth of the tumor origin

Submucosal layer

8

41.3 ± 11.3

0.181

Muscularis mucosa layer

6

34.2 ± 7.4

Total

14

38.2 ± 10.1