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Test and retest scores for the 9-item Sleep Problems Index of the Medical Outcomes Study Sleep Scale.
| Recall period | Test (n) | Retest (n) | Change (n) | p |
| 4 weeks | 59.01 ± 14.85 (79) | 57.23 ± 14.46 (79) | -2.0 ± 6.7 (78) | 0.01 |
| 1 week | 61.9 ± 15.8 (62) | 59.9 ± 15.2 (62) | -2.0 ± 9.5 (62) | 0.11 |
