<= 10 fractions | Â | 3Â months | Â | Â | Â | Â |
 | Unstable |  | Stable |  | Total |  |
 | n | % | n | % | n | % |
Unstable | 252 | 82.4 | 54 | 17.6 | 306 | 49.3 |
Stable | 5 | 1.6 | 310 | 98.4 | 315 | 50.7 |
 |  |  |  |  | 621 | 100 |
> 10 fractions |  |  |  |  |  |  |
Unstable | 88 | 75.9 | 28 | 24.1 | 116 | 56.6 |
Stable | 4 | 4.5 | 85 | 95.5 | 89 | 43.4 |
 |  |  |  |  | 205 | 100 |
<= 10 fractions | Â | 6Â months | Â | Â | Â | Â |
 | Unstable |  | Stable |  | Total |  |
 | n | % | n | % | n | % |
 | 197 | 68.9 | 89 | 31.1 | 286 | 48.5 |
 | 6 | 2.0 | 298 | 98.0 | 304 | 51.5 |
 |  |  |  |  | 590 | 100 |
> 10 fractions |  |  |  |  |  |  |
Unstable | 73 | 65.8 | 38 | 34.2 | 111 | 56.4 |
Stable | 6 | 7.0 | 80 | 93.0 | 86 | 43.7 |
 |  |  |  |  | 197 | 100 |