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Table 2 Characteristics of the matched study population in the SA-1

From: Neoadjuvant vs definitive concurrent chemoradiotherapy in locally advanced esophageal squamous cell carcinoma patients

   Surgery   CCRT   Standardized differencea
   Number or mean (sd)a (%)a Number or mean (sd)a (%)a
Age   57.00 (7.63)   56.61 (9.62)   0.05
Gender Female 6 (5) 3 (3) 0.14
Male 104 (95) 107 (97)  
Residency Non-north 76 (69) 80 (73) 0.08
North 34 (31) 30 (27)  
Tumor size ≤ 5 cm 43 (39) 42 (38) 0.02
> 5 cm 67 (61) 68 (62)  
Differentiation Poorly/undifferentiated 41 (37) 42 (38) 0.02
Well/moderately 69 (63) 68 (62)  
RT delivery Non-IGRT 94 (85) 96 (87) 0.05
IGRT 16 (15) 14 (13)  
Institution Low volume 40 (36) 45 (41) 0.09
High volume 70 (64) 65 (59)  
Use of PET Without 12 (11) 12 (11) 0.00
With 98 (89) 98 (89)  
Location Cervical 1 (1) 1 (1) 0.00
Noncervical 109 (99) 109 (99)  
  1. sd standard deviation, RT radiotherapy, IGRT image-guided RT, PET positron emission tomography, CCRT concurrent chemoradiotherapy
  2. aRounded