| 
     
      
        | Variables | Non late referral | Late Referral |  
        | group | 75< | 75> | 75< | 75> |  
        | Number    (%) | 135 (62) | 83 (38) | 44 (66) | 23 (34) |  
        | DM | 56  (41) | 7 (8) | 35    (80),** | 17    (74)** |  
        | GN | 37 (32) | 21 (63) | 4 (9)** | 3 (12) |  
        | HT | 42 (27) | 52 (27) | 2 (5)** | 2 (9)** |  
        | Others | 0 | 1 (2) | 3 (6) |  |  | 
  
    | Values are expressed as count (percentage). DM, diabetic nephropathy; GN,
      glomerular nephritis; HT, hypertensive nephrosclerosis. **indicates P<0.01
    compared with the values of each corresponding age. | 
  
    | Table 4: Comparison of underlying disease of patients between non late referral
    population and late referral. |