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Table 1 The characteristics of the bladder cancer cases and healthy controls

From: Exosome–transmitted long non-coding RNA PTENP1 suppresses bladder cancer progression

Variables Case (n = 50) N (%) Control (n = 60) N (%) P a
Age (years) (mean ± SD) 67.0 ± 9.8 66.2 ± 10.7 0.694
Sex    0.876
 Male 36 (72.0) 44 (73.3)  
 Female 14 (28.0) 16 (26.7)  
Smoking status    0.935
 Never 38 (76.0) 46 (76.7)  
 Ever 12 (24.0) 14 (23.3)  
Pack-years of smoking    0.976
 0 38 (76.0) 46 (76.7)  
 0–20 3 (6.0) 4 (6.7)  
  > 20 9 (18.0) 10 (16.6)  
Tumor grade
 G1 21 (42.0)   
 G2 14 (28.0)   
 G3 15 (30.0)   
Tumor stage
 Superficial (pTa-pT1) 41 (82.0)   
 Invasive (pT2-pT4) 9 (18.0)   
Clinical grade
 I 41 (82.0)   
 II 6 (12.0)   
 III 2 (4.0)   
 IV 1 (2.0)   
  1. aStudent’s t-test for age between cases and controls; Two-sided χ2 for other variables between cases and controls