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Frequency distribution of Pittsburgh Sleep Quality Index (PSQI) scores
| PSQI score | Absolute frequency | Relative frequency |
|---|---|---|
| PSQI > 5 | 39 | 83 |
| PSQI < 5 | 8 | 17 |
| Total | 47 | 100 |
Score ranges from 0 to 21 points, and values above 5 are considered poor sleep quality.
