Table 1. Internal consistency of the instruments used in patients with a simple elbow dislocation.
| (Sub)scale | N | Number of items | Cronbach’s alpha | |
|---|---|---|---|---|
| OES | Total | 99 | 12 | 0.882* |
| Pain | 99 | 4 | 0.783 | |
| Function | 99 | 4 | 0.825 | |
| Social-psychological | 99 | 4 | 0.804 | |
| Quick-DASH | Total | 99 | 11 | 0.886 |
| MEPI | Total | 99 | 6† | 0.383* |
| Function | 99 | 4† | 0.693 | |
| SF-36 | Total | 99 | 35 | 0.880* |
| PF | 99 | 10 | 0.864 | |
| RP | 99 | 4 | 0.792 | |
| BP | 99 | 2 | 0.664 | |
| GH | 99 | 5 | 0.758 | |
| VT | 99 | 4 | 0.747 | |
| SF | 99 | 2 | 0.810 | |
| RE | 99 | 3 | 0.974 | |
| MH | 99 | 5 | 0.788 | |
| SF-36 | PCS | 99 | 21 | 0.834 |
| SF-36 | MCS | 99 | 14 | 0.853 |
| EQ-5D | US | 99 | 5 | 0.528* |
Quick-DASH, Quick disabilities of the arm, shoulder, and hand; PF, physical functioning; RP, role limitations due to physical health; BP, bodily pain; GH, general health perceptions; VT, vitality, energy, or fatigue; SF, social functioning; RE, role limitations due to emotional problems; MH, general mental health; OES, Oxford elbow score; PCS, physical component summary; MCS, mental component summary; SF-36, Short Form-36; EQ-5D, EuroQoL-5D; US, utility score.
*Values should be interpreted carefully, since the total scale is not unidimensional.
†The item related to washing was removed from analysis, as all patients gave the same answer.