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Content validity of the PSQI.
| PSQI Subscales | I-CVI | Pc | K* |
|---|---|---|---|
| Self-reported sleep quality | 0.833 | 0.09375 | 0.816 |
| Sleep latency | 1 | 0.01563 | 1 |
| Sleep duration | 1 | 0.01563 | 1 |
| Sleep efficiency | 1 | 0.01563 | 1 |
| Sleep disturbance | 1 | 0.01563 | 1 |
| Sleep medicine use | 0.833 | 0.09375 | 0.816 |
| Daytime dysfunction | 0.667 | 0.234375 | 0.565 |
I-CVI = item-level content validity index, K* = adjusted kappa value, Pc = the probability of chance universal agreement, PSQI = Pittsburgh Sleep Quality Index.
