Table 3. Results of multivariate regression analysis assessing predictors of ΔP.
| β | 95% confidence interval | p | |
|---|---|---|---|
| Age | -0.023 | -0.087–0.040 | 0.459 |
| Male | 3.539 | 0.040–7.039 | 0.048* |
| BMI | 0.186 | 0.020–0.352 | 0.030* |
| Smoking | |||
| Current vs. never | -1.945 | -4.740–0.851 | 0.167 |
| Past vs. never | 0.207 | -2.837–3.252 | 0.891 |
| Alcohol | |||
| ≥3 vs. <3 times weekly | -0.269 | -2.156–1.618 | 0.774 |
| AHI | -0.001 | -0.037–0.035 | 0.962 |
| Total arousal events | 0.003 | -0.026–0.032 | 0.846 |
| Sleep efficiency | 0.035 | -0.050–0.120 | 0.404 |
| WASO | 0.017 | -0.008–0.042 | 0.18 |
| K-PSQI score | -1.35 | -3.183–0.483 | 0.144 |
| ISI 0.415 -1.099–1.929 0.582 | |||
| Days ≥4 hr, % | -2.311 | -6.371–1.748 | 0.255 |
| Average usage/day, hr | 0.768 | 0.077–1.459 | 0.031* |
| Average leak/day, L/min | 0.023 | -0.053–0.099 | 0.537 |
*p<0.05.
AHI: apnea hypopnea index, BMI: body mass index, ISI: Insomnia severity index, K-PSQI: Korean version of the Pittsburgh Sleep Quality Index, WASO: wake after sleep onset, ΔP: pressure difference.