Table 2.
Polysomnography Outcomes by Study Condition.
| L-PSG | H-PSG | p-value | |
|---|---|---|---|
| AHI | 2.4 [1.6–3.3; 0.8, 6.6] | 10.95 [8–17.7; 4, 24] | .001 |
| Obstructive AHI | 0.55 [0.1–1.3; 0, 3.7] | 5.25 [3.4–7.6; 0.3, 13.3] | .004 |
| OAI | 0 [0–0.1; 0, 0.3] | 0.15 [0–0.6; 0, 0.8] | .172 |
| OHI | 0.4 [0–1.3; 0, 3.6] | 5.0 [2.3–7.6; 0.3, 11.4] | .006 |
| Central AHI | 1.75 [1.2–2.4; 0.6, 3.3] | 5.3 [3.5–6.1; 0.5, 23.7] | .006 |
| CAI | 0.85 [0.2–1.1; 0, 2.8] | 1.5 [0.7–3.0; 0.5, 15.6] | .004 |
| CHI | 0.75 [0.5–1.2; 0.3, 2.4] | 3.4 [0.9–4.1; 0, 8.1] | .020 |
| 3% ODI | 3.6 [3.2–7.1; 2.8, 11.7] | 19.5 [12.7–20.9; 9.1, 23.5] | .002 |
| Mean SpO2, TST | 96.55 [95.5–97.5; 88.5, 97.7] | 91.95 [89.1–93.2; 80.9, 94.6] | .002 |
| Nadir SpO2, TST | 90 [88–91; 80, 92] | 80 [78–85; 69, 87] | .002 |
| Arousal index | 8.15 [7.6–10.3; 5.3, 12.3] | 12 [8.5–12.5; 8, 21.2] | .009 |
| Stage N1, % TST | 6.3 [4.1–7.3; 3.2, 9.5] | 11.7 [8.3–14.9; 7.4, 22.2] | .006 |
| Total sleep time, minutes | 475 [458–503] | 513 [467–522] | .114 |
| Sleep efficiency, % | 93.9 [92.4–96.1; 84.4, 97.6] | 94.6 [93.3–96; 91.8, 97.4] | .295 |
| Mean pulse rate, bpm | 66.3 [65.3–74.5; 62.2, 86.3] | 78.1 [69.4–80.9; 60.3, 97.9] | .004 |
Polysomnography outcomes for L-PSG and H-PSG are presented as median [inner-quartile range; minimum, maximum] with comparisons between study condition made using the Wilcoxon signed rank-sum test or paired t-test.
AHI = apnea-hypopnea index; bpm = beats per minute; CAI = central apnea index; CHI = central hypopnea index; H-PSG = high-altitude home polysomnography; L-PSG = lower altitude laboratory polysomnography; OAI = obstructive apnea index; ODI = oxygen desaturation index; OHI = obstructive hypopnea index; TST = total sleep time.