| Variables | Mean GFR | X2 | P-value |
| Duration |
|
|
|
| 1 - 5.99 mths | 96.26 ± 16.30. | 11.82 | <0.001 |
| 6 - 11.99 mths | 92.44 ± 14.52 |
|
|
| 1 - 4.99 yrs | 80.90 ± 18.72 |
|
|
| >5 yrs | 67.55 ± 12.28 |
|
|