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Table 1 Characteristics of matched study population in the primary analysis

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   56.93 (8.65)   57.26 (10.48)   0.04
Gender Female 8 (5) 7 (5) 0.03
Male 141 (95) 142 (95)  
Residency Non-north 101 (68) 100 (67) 0.01
North 48 (32) 49 (33)  
Tumor size ≤ 5 cm 59 (40) 60 (40) 0.01
> 5 cm 90 (60) 89 (60)  
Differentiation Poorly/undifferentiated 46 (31) 53 (36) 0.10
Well/moderately 103 (69) 96 (64)  
RT delivery Non-IGRT 131 (88) 128 (86) 0.06
IGRT 18 (12) 21 (14)  
Institution Low volume 50 (34) 54 (36) 0.06
High volume 99 (66) 95 (64)  
Period 2008–2009 18 (12) 19 (13) 0.02
2010–2015 131 (88) 130 (87)  
Location Cervical 1 (1) 1 (1) 0.00
Noncervical 148 (99) 148 (99)  
  1. sd standard deviation, RT radiotherapy, IGRT image-guided RT, CCRT concurrent chemoradiotherapy
  2. aRounded