| Period | N | Mini | Maxi | Mean | Std. error Mean | Std. Deviation | Variance |
NPL | Pre | 6 | 6.91 | 17.60 | 12.625 | 1.800 | 4.409 | 19.441 |
Post | 6 | 10.98 | 21.59 | 15.787 | 1.637 | 4.010 | 16.081 |