Table 2.
Polysomnographic-derived sleep and respiratory parameters of all participants and comparison between participants with and without OSA.
| All (n = 75) | Non-OSA (n = 53) | OSA (n = 22) | P | |
|---|---|---|---|---|
| Sleep parameters | ||||
| Lights out, hh:mm | 20:48 ± 02:33 | 20:43 ± 03:00 | 20:59 ± 00:39 | .69 |
| Lights on, hh:mm | 05:40 ± 00:56 | 05:40 ± 00:54 | 05:40 ± 01:01 | .94 |
| Time in bed, h | 8.5 ± 1.1 | 8.4 ± 1.2 | 8.8 ± 0.9 | .15 |
| Sleep latency, min | 10 (5.0–19.8) | 9.0 (5.0–16.0) | 11.0 (5.6–26.4) | .39 |
| TST, h | 6.57 ± 1.03 | 6.63 ± 1.08 | 6.42 ± 0.88 | .43 |
| Sleep efficiency, % | 81.0 (72.0–85.0) | 82.0 (73.0–87.0) | 75.0 (67.3–82.0) | .04 |
| WASO, min | 80.0 (47.3–126.8) | 74.0 (40.0–108.5) | 84.5 (68.3–135.1) | .04 |
| Stage N1 sleep, % of TST | 14.0 (12.0–18.0) | 13.0 (11.0–17.0) | 15.5 (14.0–20.0) | < .01 |
| Stage N2 sleep, % of TST | 45.2 ± 8.4 | 46.5 ± 8.5 | 42.0 ± 7.6 | .03 |
| Stage N3 sleep, % of TST | 19.3 ± 8.4 | 19.2 ± 9.1 | 19.5 ± 6.8 | .89 |
| REM sleep, % of TST | 19.6 ± 5.5 | 19.7 ± 6.0 | 19.5 ± 4.1 | .89 |
| REM sleep latency, min | 93.8 ± 45.0 | 95.4 ± 44.8 | 89.9 ± 46.3 | .63 |
| Total arousals, n | 81.0 (50.0–123.5) | 63.0 (48.0–99.0) | 134.0 (92.3–157.0) | < .0001 |
| Arousal index, events /h | 14.0 ± 7.3 | 11.4 ± 5.7 | 20.3 ± 7.2 | < .0001 |
| Arousal w/ respiratory event, n | 18.0 (8.0–39.5) | 13.0 (6.0–19.0) | 51.5 (39.3–69.5) | < .0001 |
| Awakening index, events/h | 4.6 (3.4–5.6) | 4.6 (3.3–5.5) | 4.9 (3.6–5.6) | .42 |
| Respiratory parameters | ||||
| AHI < 5 events/h, n (%) | 27 (36) | 27 (50.9) | — | — |
| 5 ≤ AHI < 15 events/h, n (%) | 26 (34.7) | 26 (49.1) | — | — |
| 15 ≤ AHI < 30 events/h, n (%) | 14 (18.7) | — | 14 (63.6) | — |
| 30 ≤ AHI < 45 events/h, n (%) | 4 (5.3) | — | 4 (18.2) | — |
| AHI ≥ 45 events/h, n (%) | 4 (5.3) | — | 4 (18.2) | — |
| AHI, events/h | 7.6 (4.3–16.7) | 4.9 (2.9–7.7) | 23.2 (18.7–38.9) | < .0001 |
| AHI, REM sleep, events/h | 10.5 (4.1–33.2) | 6.4 (1.9–13.6) | 42.6 (30.3–60.8) | < .0001 |
| AHI, NREM sleep, events/h | 5.9 (3.0–10.9) | 4.0 (1.8–6.3) | 21.2 (14.9–35.5) | < .0001 |
| OAI, events/h | 2.9 (0.6–6.6) | 1.2 (0.3–4.0) | 11.0 (5.4–21.8) | < .0001 |
| MAI, events/h | 0.0 (0.0–0.0) | 0.0 (0.0–0.0) | 0.0 (0.0–0.2) | < .01 |
| CAI, events/h | 0.0 (0.0–0.0) | 0.0 (0.0–0.0) | 0.0 (0.0–0.7) | < .01 |
| HI, events/h | 3.8 (2.0–1.8) | 2.7 (1.8–4.7) | 12.8 (11.5–16.4) | < .0001 |
| Mean SpO2, % | 95.5 ± 2.6 | 967 ± 1.5 | 92.9 ± 2.6 | < .0001 |
| Min SpO2, % | 89.5 (82.8–93.0) | 91.0 (89.0–94.0) | 81.0 (76.0–84.5) | < .0001 |
| Total desaturation ≥ 3%, n | 18.2 (3.7–69.0) | 8.7 (1.6–20.1) | 170.2 (71.4–225.3) | < .0001 |
| ODI, TST 3%, events/h | 2.7 (0.6–11.6) | 1.3 (0.3–3.0) | 25.3 (11.8–31.0) | < .0001 |
| ODI, REM sleep, events/h | 6.6 (0.0–29.3) | 2.6 (0.0–6.8) | 38.6 (26.6–68.8) | < .0001 |
| ODI, NREM sleep, events/h | 1.8 (0.4–7.6) | 0.7 (0.2–2.0) | 21.4 (7.9–26.6) | < .0001 |
| Time spent between 71%–80% SpO2, % | 0.0 (0.0–0.0) | 0.0 (0.0–0.0) | 0.0 (0.0–0.8) | < .001 |
| Time spent between 81%–90% SpO2, % | 0.1 (0.0–2.5) | 0.0 (0.0–0.1) | 7.5 (2.4–24.2) | < .0001 |
| Time spent between 91%–100% SpO2, % | 99.5 (93.8–99.9) | 99.9 (98.8–100.0) | 91.9 (58.7–97.5) | < .0001 |
Data are presented as mean ± SD or median (25%–75% IQR). P values represent between-group comparisons using Student t tests, Mann-Whitney U tests, or Fisher exact tests. AHI = apnea-hypopnea index, CAI = central apnea index, HI = hypopnea index, MAI = mixed apnea index, NREM = non-rapid eye movement, OAI = obstructive apnea index, ODI = oxygen desaturation index, OSA = obstructive sleep apnea, REM = rapid eye movement, SD = standard deviation, SpO2 = peripheral oxygen saturation, TST = total sleep time, WASO = wake after sleep onset.