Table 2 Internal consistency of subscales
| Â | Number of items | Cronbach's alpha | % variance explained* | ||
|---|---|---|---|---|---|
Domains | Initial | Final | Initial | Final | Â |
Treatment effectiveness (TE) | 6 | 3 | 0.884 | 0.828 | 75% |
Convenience of use (CU) | 6 | 2 | 0.661 | 0.698 | 77% |
Impact on activities of daily living (ID) | 7 | 3 | 0.817 | 0.881 | 81% |
Medical care (MC) | 5 | 3 | 0.947 | 0.922 | 87% |
Undesirable side-effects (UE) | 6 | 3 | 0.872 | 0.929 | 88% |
General satisfaction (GS) | 8 | 3 | 0.765 | 0.882 | 81% |
Overall score | 38 | 17 | 0.923 | 0.904 | 83% |