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Number of items eliminated and cause for elimination
| Cause for elimination | ||||||
|---|---|---|---|---|---|---|
| Question set | Original # of items | Item-total correlation < 0.40 | Simple structure violation | Local dependence | DIF | Final # of items |
| Cognitive | 28 | 5 | 3 | 5 | 0 | 15 |
| Emotional | 28 | 5 | 1 | 0 | 2 | 20 |
| Pain | 17 | 0 | 0 | 4 | 0 | 13 |
| Sleep | 20 | 2 | 0 | 4 | 2 | 12 |
| Social | 28 | 3 | 1 | 3 | 4 | 17 |
| Stiffness | 19 | 0 | 1 | 2 | 1 | 15 |
