Table 2.
Comparison of PSG measurements in MSA patients with and without SRBD.
| Variables | All MSA patients (n = 66) | With SRBD (n = 52) | Without SRBD (n = 14) | p |
|---|---|---|---|---|
| TST | 337.0 ± 90.2 | 334.3 ± 86.4 | 346.9 ± 106.0 | 0.647 |
| SE, % | 66.0 ± 17.3 | 65.9 ± 16.9 | 66.4 ± 19.6 | 0.920 |
| SL, min | 22.9(5–28) | 22.8(5.5–26.1) | 23.1(2.4–33.9) | 0.660 |
| N1, % | 32.2(30.6–42.35) | 33.8(19.6–43.6) | 25.9(14.5–34.6) | 0.134 |
| N2, % | 48.1 ± 14.6 | 47.88 ± 15.3 | 48.89 ± 12.0 | 0.819 |
| N3, % | 1.5(0–0.32) | 1.1(0–0.3) | 3.0(0–2.7) | 0.369 |
| REM sleep, % | 18.3 ± 3.8 | 17.19 ± 6.9 | 22.21 ± 9.8 | 0.890 |
| WASO, min | 151.1 ± 83.9 | 150.8 ± 81.2 | 152.1 ± 96.4 | 0.962 |
| Arousal index, /h | 19.7(13.6–23.6) | 20.6(11.5–26.0) | 16.3(10.5–21.5) | 0.246 |
| OA index, /h | 7.6(0–9) | 10.0(4.1–10.6) | 0.1(0–0.3) | 0.000 |
| CA index, /h | 0.4(0–0.4) | 0.5(0–0.5) | 0.1(0–0.1) | 0.122 |
| hypopnea index, /h | 9.6 (3.4–17.3) | 14.7(8.5–19.3) | 2.3(1.3–2.9) | 0.000 |
| Total OA times | 1.0(0–2.0) | 1.65(0–2) | 1.0(0.0–3.0) | 0.363 |
| Total CA times | 0(0–2.0) | 0.5(0–0.25) | 1.0(0–2.0) | 0.048 |
| Percentage of snoring, % | 5.3(1.2–5.9) | 6.6(0.1–5.7) | 4.6(0–6.6) | 0.447 |
| Average SaO2, % | 94.1(93–96) | 93.7(93–95) | 95.5(95.8–97) | 0.001 |
| Minimum SaO2, % | 85.4(83–90) | 83.9(81.2–89.0) | 90.3(89.8–93.3) | 0.000 |
| ODI,/h | 14.9 (6.1–31.9) | 19.9(10.9–36.6) | 2.5(1.5–4.0) | 0.000 |
| Average snoring time, (min) | 7.4(3–10.8) | 8.3(5.1–12.2) | 4.2(0–7.5) | 0.015 |
| PLMI, /h | 25.2(4.3–43.5) | 25.15(4.8–41.0) | 25.3(21.2–44.0) | 0.733 |
CA, Central apnea; MSA, Multiple system atrophy; REM, Rapid eye movement; OA, Obstructive apnea; ODI, Oxygen desaturation index; PLMI, Periodic leg movement during sleep index; SE, Sleep efficiency; SL, Sleep latency; SaO2, Oxygen saturation; TST, Total sleep time; and WASO, Wake after sleep onset.
Values are n (%), mean ± SD or median (interquartile range). Bold values indicate p < 0.05, indicating statistically significant differences between the two groups.