Table 3.
Partial correlations between nocturnal PSG variables and daytime function in chronic and acute OSA
| Variable | Chronic OSA | Acute OSA | |||
|---|---|---|---|---|---|
| PVT Lapses | MSLT | ESS | PVT Lapses | MSLT | |
| AHI3A | 0.28 | −0.42* | 0.14 | 0.61** | −0.31 |
| TST | 0.17 | 0.23 | 0.07 | −0.19 | 0.2 |
| WASO | −0.34 | −0.06 | 0.26 | −0.26 | 0.09 |
| Stage N2 | −0.39 | 0.67** | −0.12 | −0.58** | 0.36 |
| SWS | −0.33 | 0.12 | 0.09 | −0.21 | −0.09 |
| REM | 0.05 | 0.32 | 0.09 | −0.51* | 0.25 |
| %SWA | −0.34 | 0.34 | −0.35 | −0.42 | 0.17 |
| PVT Lapses | — | −0.53** | 0.28 | — | −0.62** |
| MSLT | −0.53** | — | −0.23 | −0.62** | — |
| ESS | 0.29 | −0.23 | — | — | — |
Values reported are Spearman’s rank correlation coefficients (rho). All partial correlations were adjusted for age, sex, and BMI. The correlations between PSG variables and PVT Lapses (Rows 1–6, Column 2) in chronic OSA were adjusted for ESS as well. Note that ESS was not administered on the acute CPAP withdrawal visit. %SWA: relative frontal slow-wave activity (0.5–4 Hz) during NREM sleep. SWS, slow-wave sleep.
*p < 0.05; **p < 0.01.