Table 3. The primary and secondary outcomes assessing the clinical utility of daytime PSG.
| PSG parameters | Daytime PSG, median (IQR) | Overnight PSG, median (IQR) | Unadjusted P value |
Adjusted coefficient* (95% CI) |
Adjusted P value* |
Adjusted coefficient† (95% CI) | Adjusted P value† |
|---|---|---|---|---|---|---|---|
| Primary outcomes | |||||||
| Per cent sleep efficiency | 63.4 (51.2–68.2) |
69.9 (65.5–76.1) |
0.001 | −5.6 (−11.7 to 0.5) |
0.072 | −3.39 (−12.4 to 5.7) |
0.456 |
| Secondary outcomes | |||||||
| Per cent REM sleep | 42.6 (34.4–46.9) |
36.5 (30.7–41) |
0.095 | 4.7 (−1.4 to 10.8) |
0.129 | 9.9 (1.1 to 18.8) |
0.028 |
| Spontaneous arousal per hour of sleep time (number) | 16.8 (15.4–20.7) |
15.6 (12.6–24.2) |
0.455 | −3.8 (−7.6 to 0.12) |
0.058 | −4.0 (−9.8 to 1.7) |
0.165 |
| Sleep REM latency (min) | 4.8 (0.3–31.8) |
22.8 (7–32.7) |
0.105 | 2.1 (−16.1 to 20.1) |
0.822 | 12.1 (−14.5 to 38.8) |
0.366 |
| Sleep latency (min) | 4.5 (2–15.3) |
9.3 (0–24.5) |
0.737 | −11.2 (−23.0 to 0.6) |
0.064 | −9.6 (−27.2 to 8.0) |
0.281 |
| Apnoea-Hypopnoea Index (AHI) | 18.6 (11.5–33.5) |
17 (10.3–30.4) |
0.738 | −2.8 (−14.5 to 8.9) |
0.635 | −0.04 (−17.5 to 17.4) |
0.996 |
| Obstructive Apnoea-Hypopnoea Index (OAHI) | 5.5 (3.6–11.2) |
6.3 (1.5–14.3) |
0.956 | −2.9 (−10.1 to 4.3) |
0.417 | −0.50 (−11.1 to 10.2) |
0.925 |
*
Adjusted for covariate, age at PSG.
†
Adjusted for covariates, age at PSG and total recording time.
PSG, polysomnography; REM, rapid eye movement.