(a).
| Placebo statistic | PSQI | Quality of sleep POD1 (Scale 0–3) |
Quality of sleep POD2 (Scale 0–3) |
|---|---|---|---|
| (n) | 12 | 12 | 12 |
| Mean | 7.333 | 1.333 | 1.000 |
| Variance (n − 1) | 18.970 | 0.424 | 0.727 |
| Standard deviation (n − 1) | 4.355 | 0.651 | 0.853 |
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