| Group Studied | 
  Genotypes | 
  Allele frequencies | 
    
   
  |   | 
  CC | 
  CT | 
  TT | 
  C | 
  T | 
    
   
  Control 
    (N = 118) | 
  20 
    (16.95) | 
  45 
    (38.14) | 
  53 
    (44.91) | 
  85 
    (36.02) | 
  151 
    (63.98) | 
    
   
  T2DM 
    (N = 122) | 
  13 
    (10.66) | 
  64 
    (52.46) | 
  45 
    (36.88) | 
  90 
    (36.88) | 
  154 
    (63.12) | 
    
   
  T2DNH 
    (N = 84) | 
  14 
    (16.67) | 
  43 
    (51.19) | 
  27 
    (32.14) | 
  71 
    (42.26) | 
  97 
    (57.74) | 
    
   
  |   | 
  X2 = 7.289 , P= 0.121 | 
  X2 = 1.82 , P= 0.403 | 
    
   |