Table 3.
Polysomnographic results of OSA patients with different smoking histories
| Measurements | Non-smoker (N=796) | Current/former smoker (N=225) | t or Z | p |
|---|---|---|---|---|
| Sleep efficiency (%) | 85.6 ± 11.7 | 85.0 ± 12.2 | 0.627 | 0.531 |
| WASO (min) | 27.3 (13.0–62.9) | 28.0 (13.0–72.8) | −0.525 | 0.599 |
| SL (min) | 18.5 (10.0–34.0) | 20.5 (12.3–39.3) | −1.986 | 0.047* |
| Stage N1 ratio (%) | 42.6 ± 18.1 | 42.1 ± 18.8 | 0.361 | 0.718 |
| Stage N2 ratio (%) | 43.8 ± 15.1 | 42.8 ± 15.6 | 0.954 | 0.340 |
| Stage N3 ratio (%) | 18.5 (10.0–34.0) | 20.5 (12.3–39.3) | −1.689 | 0.091 |
| Stage REM ratio (%) | 7.3 (1.3–12.2) | 7.0 (0.6–13.2) | −0.041 | 0.967 |
| MAI (h−1) | 43.4 ± 19.2 | 44.1 ± 22.0 | −0.484 | 0.629 |
| AHI (h−1) | 43.6 ± 24.2 | 44.5 ± 26.8 | −0.418 | 0.676 |
| Maximum apnea duration (s) | 54.9 ± 21.9 | 55.4 ± 25.0 | −0.286 | 0.775 |
| Nadir SpO2 (%) | 71.7 ± 13.2 | 70.2 ± 14.8 | 1.383 | 0.168 |
| Mean SpO2 (%) | 92.8 ± 3.4 | 91.8 ± 3.6 | 3.835 | <0.001* |
| ODI (h−1) | 44.1 (22.8–64.7) | 40.7 (23.6–63.9) | −0.186 | 0.853 |
| SIT90 (%) | 8.5 (1.6–23.7) | 8.7 (1.5–20.9) | −0.092 | 0.926 |
Values are given as mean ± standard deviation or median and interquartile range. OSA: obstructive sleep apnea. WASO: wake after sleep onset. SL: sleep latency. REM: rapid eye movement. MAI: micro-arousal index. AHI: apnea hypopnea index. SpO2: peripheral oxygen saturation. ODI: oxygen desaturation index. SIT90: saturation impair time below 90%.
*
p-values indicate statistical significance.