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Table 3 Characteristics of the matched study population in the SA-2

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

   Surgery [MIE]   CCRT   Standardized differencea
   Number or mean (sd)a (%)a Number or mean (sd)a (%)a
Age   56.38 (8.21)   55.35 (10.58)   0.11
Gender Female 4 (5) 4 (5) 0.00
Male 78 (95) 78 (95)  
Residency Non-north 57 (70) 52 (63) 0.13
North 25 (30) 30 (37)  
Tumor size ≤ 5 cm 31 (38) 31 (38) 0.00
> 5 cm 51 (62) 51 (62)  
Differentiation Poorly/undifferentiated 31 (38) 30 (37) 0.03
Well/moderately 51 (62) 52 (63)  
RT delivery Non-IGRT 70 (85) 68 (83) 0.07
IGRT 12 (15) 14 (17)  
Institution Low volume 23 (28) 25 (30) 0.05
High volume 59 (72) 57 (70)  
Use of PET Without 7 (9) 11 (13) 0.16
With 75 (91) 71 (87)  
  1. The nonoverlapped covariable (location) was not included in this matching
  2. sd standard deviation, RT radiotherapy, IGRT image-guided RT, PET positron emission tomography, MIE minimally invasive esophagectomy, CCRT concurrent chemoradiotherapy
  3. aRounded