| Duration of diseases | p value | ||
---|---|---|---|---|
1-5yrs | 5-10yrs |  > 10yrs | ||
Right N1 | 11.48 ± 1.09 | 12.06 ± .98 | 12.11 ± 1.92 | 0.14 |
Right P1 | 13.52 ± 1.43 | 14.30 ± 1.02 | 14.50 ± 1.48 | 0.06 |
Left N1 | 11.17 ± 1.31 | 11.88 ± 1.10 | 11.84 ± 1.21 | 0.1 |
Left P1 | 12.88 ± 2.83 | 14.28 ± 1.32 | 13.93 ± 1.16 | 0.086 |