Comparisons of partner questionnaire responses in each intervention month of the crossover trial
| Partner questionnaire responses | CPAP limb | Placebo limb | p value |
| Median (IQR) subjective sleep quality score for month | 1 (1–2) | 1 (0.75–2) | 0.05 |
| Median (IQR) PSQI score3-150 | 6 (4–10.5) | 7 (4.5–11) | 0.08 |
| Median (IQR) total sleep disturbance score for month | 2 (1.5–5) | 5 (3–6) | 0.03 |
| Mean (SD) ESS | 6.5 (4.5) | 5.9 (4.3) | 0.3 |
| Median (IQR) FOSQ | 14.5 (12.9) | 14.7 (15.9) | 0.7 |
| Mean (SD) SF36 physical summary score | 44.0 (15) | 43.5 (13) | 0.7 |
| Mean (SD) SF36 mental summary score | 46.8 (9) | 48.2 (9) | 0.4 |
| Median (IQR) Enrich score | 45 (39–56) | 51 (31–58) | 0.6 |
| Median (IQR) partner's reported change in patient's sleep quality | 2 (1–3) | 0 (0–1) | 0.007 |
| Median (IQR) partner's reported change in patient's daily functioning | 1 (0–3) | 0 (0–1) | 0.03 |
PSQI = Pittsburgh Sleep Quality Inventory; ESS = Epworth Sleepiness Scale; FOSQ = Functional Outcomes of Sleep Quality; SF36 = Short Form 36 questionnaire; Enrich = Enrich marital satisfaction questionnaire.
↵3-150 PSQI: higher scores = worse sleep quality.