Table 3.
Reliability and validity analysis of OAQoL items
| Questions | Scale mean | Scale variance | Corrected correlation | Cronbach's alpha |
|---|---|---|---|---|
| 1. I’m unable to join in activities with my friends or family | 9.56 | 39.04 | 0.642 | 0.926 |
| 2. I get embarrassed using stairs in public | 9.46 | 39.08 | 0.629 | 0.927 |
| 3. I feel like I am missing out on life | 9.59 | 38.93 | 0.670 | 0.926 |
| 4. I can’t plan things too far in advance | 9.68 | 39.32 | 0.644 | 0.926 |
| 5. I feel as though I’m trapped in my house | 9.76 | 40.04 | 0.581 | 0.927 |
| 6. My arthritis limits the places I can go | 9.10 | 41.98 | 0.283 | 0.931 |
| 7. I can’t do things on the spur of the moment | 9.34 | 40.12 | 0.480 | 0.929 |
| 8. It interferes with everything I do | 9.46 | 38.18 | 0.780 | 0.924 |
| 9. Walking for pleasure is out of the question | 9.51 | 38.42 | 0.739 | 0.924 |
| 10. I can’t enjoy myself when I go out | 9.54 | 38.52 | 0.726 | 0.925 |
| 11. I feel useless | 9.83 | 40.41 | 0.595 | 0.927 |
| 12. I feel I can’t join in with social activities | 9.58 | 38.59 | 0.724 | 0.925 |
| 13. My arthritis controls my life | 9.54 | 38.25 | 0.773 | 0.924 |
| 14. I feel dependent on others | 9.66 | 38.33 | 0.812 | 0.923 |
| 15. I worry about being a nuisance to other People | 9.42 | 41.62 | 0.219 | 0.934 |
| 16. My life revolves around my arthritis | 9.64 | 40.30 | 0.456 | 0.930 |
| 17. I can’t be as independent as I want | 9.37 | 40.75 | 0.366 | 0.931 |
| 18. I feel very isolated | 9.81 | 39.77 | 0.707 | 0.926 |
| 19. I can’t live life to the full | 9.36 | 40.88 | 0.347 | 0.932 |
| 20. I have to limit what I do each day | 9.22 | 41.79 | 0.237 | 0.933 |
| 21. I feel slowed down | 9.59 | 38.24 | 0.790 | 0.924 |
| 22. I can’t go to the places I want to go | 9.61 | 38.03 | 0.834 | 0.923 |
| Overall (for 22 items) | 9.98 | 43.29 | 0.93 | 0.93 |