Table 4 Summary of internal consistency, stability, and construct validity for MOS Sleep-R standard and acute form subscales and global index measures
Form | Subscale/Index | Number of items | Stability (ICC) | Internal consistency (Cronbach’s alpha) | Mean item-corrected parent subscale correlation within subscale (minimum-maximum) | Mean item-non-parent subscale correlation across subscales (minimum-maximum) | Scaling successa | Success rate (%)b |
|---|---|---|---|---|---|---|---|---|
Standard | Disturbance | 4 | 0.81 | 0.85 | 0.71 (0.61–0.82) | 0.36 (0.10–0.55) | 20 | 100 |
Adequacy | 2 | 0.68 | 0.84 | 0.72 (0.72–0.72) | 0.39 (0.15–0.57) | 10 | 100 | |
Somnolence | 3 | 0.81 | 0.76 | 0.61 (0.49–0.71) | 0.33 (0.18–0.56) | 15 | 100 | |
Snoring | 1 | 0.85 | – | – | 0.22 (0.19–0.27) | – | – | |
SOBH | 1 | 0.33 | – | – | 0.32 (0.22–0.40) | – | – | |
Optimal quantity | 1 | 0.34 | – | – | 0.19 (0.04–0.41) | – | – | |
SPI-I | 6 | 0.75 | 0.83 | 0.61 (0.41–0.69) | – | – | – | |
SPI-II | 9 | 0.81 | 0.88 | 0.63 (0.43–0.75) | – | – | – | |
Acute | Disturbance | 4 | 0.78 | 0.86 | 0.72 (0.62–0.82) | 0.41 (0.16–0.56) | 20 | 100 |
Adequacy | 2 | 0.70 | 0.85 | 0.74 (0.74–0.74) | 0.44 (0.20–0.59) | 10 | 100 | |
Somnolence | 3 | 0.75 | 0.78 | 0.64 (0.51–0.75) | 0.37 (0.18–0.63) | 14 | 93 | |
Snoring | 1 | 0.83 | – | – | 0.24 (0.20–0.28) | – | – | |
SOBH | 1 | 0.69 | – | – | 0.39 (0.23–0.48) | – | – | |
Optimal quantity | 1 | 0.71 | – | – | 0.21 (0.07–0.32) | – | – | |
SPI-I | 6 | 0.82 | 0.85 | 0.64 (0.50–0.69) | – | – | – | |
SPI-II | 9 | 0.82 | 0.90 | 0.67 (0.51–0.76) | – | – | – |