Table 3 Cronbach's alpha and item convergent and discriminant criteria of the MOS-Sleep multi-item scores (N = 381)
Multi-item scores | No of items | Cronbach's alpha | Range of item-scale correlations | % of items meeting the convergent criterion | % of items meeting the discriminant criterion |
|---|---|---|---|---|---|
Sleep disturbance | 4 | 0.80 | 0.51–0.76 | 100% | 100% |
Somnolence | 3 | 0.74 | 0.47–0.63 | 100% | 100% |
Sleep adequacy | 2 | 0.71 | 0.55–0.55 | 100% | 100% |
Sleep problems index | 9 | 0.81 | 0.34–0.62 | 78% (all except items 5 and 9) | NA |