Table 5.
Internal consistency of the questionnaires’ subscales using Cronbach Alpha
| Subscale | Time | Cronbach Alpha (%) |
| SF-36 Physical | 2 weeks preoperatively | 72.4 |
| 3 months postoperatively | 78.8 | |
| 6 months postoperatively | 80.2 | |
| 12 months postoperatively | 81.7 | |
| SF-36 Mental | 2 weeks preoperatively | 83.1 |
| 3 months postoperatively | 86.4 | |
| 6 months postoperatively | 6.0 | |
| 12 months postoperatively | 78.7 | |
| STAI-Y1 | 2 weeks preoperatively | 88.6 |
| 3 months postoperatively | 93.7 | |
| 6 months postoperatively | 92.8 | |
| 12 months postoperatively | 35.0 | |
| STAI-Y2 | 2 weeks preoperatively | 80.1 |
| 3 months postoperatively | 86.6 | |
| 6 months postoperatively | 87.0 | |
| 12 months postoperatively | 84.8 |