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Table 1 Clinicopathologic characteristics of 169 patients with 175 superficial esophageal squamous cell carcinomas in this study

From: Endoscopic submucosal dissection under general anesthesia for superficial esophageal squamous cell carcinoma is associated with better clinical outcomes

Variables  
Age (years) 64.5 ± 7.9
Gender, male 157 (92.9)
Body mass index (Kg/m2) 23.6 ± 2.9
Smoking
 Current smoker 32 (18.9)
 Ex-smoker 81 (47.9)
 Never-smoker 56 (33.1)
Alcohol
 None 95 (56.2)
 > 1 day/month 18 (10.7)
 > 1 day/week 27 (16.0)
 > 4 days/week 29 (17.2)
Diabetes mellitus (yes) 25 (14.8)
Hypertension (yes) 51 (30.2)
Tumor location
 Upper thoracic 13 (7.4)
 Middle thoracic 46 (26.3)
 Lower thoracic 113 (64.6)
 Esophagogastric junction 3 (1.7)
Tumor morphology
 IIa 26 (14.9)
 IIb 125 (71.4)
 IIc 21 (12.0)
 Mixed 3 (1.7)
Gross tumor size (cm) 1.5 ± 0.9
Pathologic tumor size (cm) 1.5 ± 0.8
Histologic differentiation
 Well differentiated 34 (19.4)
 Moderately differentiated 140 (80.0)
 Poorly differentiated 1 (0.6)
Circumferential size of the tumor (of lumen)
 <  1/4 50 (28.6)
 ≥ 1/4, <  1/2 109 (62.3)
 ≥ 1/2, <  3/4 16 (9.1)
 ≥ 3/4 0 (0)
Circumferential size of the post-ESD mucosal defect (of lumen)
 <  1/4 5 (2.9)
 ≥ 1/4, <  1/2 68 (38.9)
 ≥ 1/2, <  3/4 85 (48.6)
 ≥ 3/4 17 (9.7)
Depth of tumor invasion
 M1 26 (14.9)
 M2 71 (40.6)
 M3 42 (24.0)
 SM1 10 (5.7)
 SM2&3 26 (14.9)
Method of sedation
 Conscious sedation 93 (53.1)
 General anesthesia 82 (46.9)
  1. Data are presented as mean ± SD or number (%) of patients or lesions