Table 2.
Polysomnography data for children with and without POSA.
| Non-POSA (n = 18) | POSA (n = 25) | P | |
|---|---|---|---|
| Total sleep time, minutes | 367.3 (325.8–429.9) | 346.5 (311.5–388.3) | .07 |
| Sleep-onset latency, minutes | 24.1 (6.4–49.5) | 15.0 (5.6–47.5) | .35 |
| REM latency, minutes | 117.3 (71.9–239.5) | 132.0 (95.8–219.2) | .40 |
| Sleep efficiency, % | 85.5 (72.4–92.4) | 77.7 (72.4–89.1) | .40 |
| Wake after sleep onset, minutes | 34.0 (15.5–64.9) | 45.0 (21.0–97.0) | .20 |
| Arousal index, events/h | 15.6 (9.6–19.5) | 15.5 (10.3–22.8) | .66 |
| REM sleep, % | 18.1 (11.7–26.1) | 16.6 (10.8–20.0) | .25 |
| NREM-1 sleep, % | 10.8 (5.4–12.7) | 8.2 (4.4–13.1) | .42 |
| NREM-2 sleep, % | 46.3 (42.1–52.6) | 51.6 (44.2–55.2) | .20 |
| NREM-3 sleep, % | 22.0 (17.7–33.5) | 23.4 (18.3–29.5) | .98 |
| Obstructive AHI NREM, events/h | 10.8 (6.9–18.8) | 7.9 (5.5–18.5) | .65 |
| Obstructive AHI REM, events/h | 23.6 (11.8–45.5) | 21.8 (6.1–32.1) | .17 |
| Obstructive AHI, events/h | 12.0 (9.0–26.7) | 11.3 (7.6–21.6) | .28 |
| Supine AHI, events/h | 11.5 (6.3–25.4) | 22.0 (11.2–40.7) | .02a |
| Nonsupine AHI, events/h | 12.1 (8.8–32.3) | 3.9 (2.3–8.5) | <.001a |
| NREM supine AHI, events/h | 6.1 (0.0–14.2) | 20.4 (9.3–37.3) | .01a |
| NREM nonsupine AHI, events/h | 10.5 (2.4–24.5) | 2.4 (0.0–6.0) | .02a |
| REM supine AHI, events/h | 24.0 (2.9–60.5) | 23.8 (0.0–44.8) | .27 |
| REM nonsupine AHI, events/h | 3.2 (0.0–24.2) | 4.1 (0.0–9.0) | .81 |
| Total time spent in supine, minutes | 237.5 (110.3–279.3) | 155.5 (67.5–252.3) | .25 |
| Total time spent in nonsupine, minutes | 144.5 (73.5–208.9) | 177.5 (92.8–251.8) | .48 |
| Total time spent in supine during NREM sleep, minutes | 199.5 (2.5–238.0) | 95.5 (51.0–227.0) | .42 |
| Total time spent in nonsupine during NREM sleep, minutes | 108.0 (38.8–140.3) | 117.0 (55.0–216.0) | .55 |
| Total time spent in supine during REM sleep, minutes | 29.3 (1.1–43.4) | 23.5 (2.5–44.5) | .84 |
| Total time spent in nonsupine during REM sleep, minutes | 25.0 (1.1–89.0) | 23.5 (3.5–61.5) | .70 |
| Mean SaO2, % | 96.6 (96.0–97.3) | 97.5 (96.6–98.1) | .02a |
| Nadir SaO2, % | 86.7 (78.8–89.8) | 87.0 (83.5–90.6) | .68 |
| Desaturation index, events/h | 11.1 (5.4–20.1) | 7.0 (4.0–12.2) | .17 |
Data are presented as medians (25th–75th percentile) unless otherwise indicated. P values were calculated using Mann-Whitney U independent-samples tests adjusted for unequal variance. AHI = apnea-hypopnea index; NREM = non–rapid eye movement; POSA = positional obstructive sleep apnea; REM = rapid eye movement; SaO2 = oxygen saturation. aP ≤ .05 represents a statistically significant difference between both groups.