Table 1.
Demographic characteristics and polysomnography results of patients with upper airway resistance syndrome (UARS) (N = 49) and control subjects (N = 9).
| Variables | UARS (N = 49) | Normal (N = 9) |
|---|---|---|
| Age | 26.8 ± 5.8 | 27.8 ± 4.0 |
| Male/female | 12/37 | 3/6 |
| BMI, kg/m2 | 22.2 ± 2.9 | 24.9 ± 2.8* |
| Apnea–hypopnea index, no./h | 3.1 ± 1.5 | 0.8 ± 1.1* |
| TST, min | 411 ± 77 | 370 ± 39* |
| Sleep efficiency, % | 85 ± 12 | 91.6 ± 6* |
| NREM Stage 1, % | 8 ± 5 | 2 ± 1* |
| NREM Stage 2, % | 61 ± 9 | 51 ± 6* |
| NREM Stage 3–4, % | 16 ± 9 | 26 ± 5* |
| Stage REM | 15 ± 5 | 19 ± 4* |
| HF | 27.8 ± 18.2 | 22.5 ± 11.12* |
| LF | 36.3 ± 16.4 | 32.4 ± 8.7 |
| LF/HF | 1.51 ± 0.53 | 1.69 ± 0.74 |
| PPGres | 5.43 ± 1.47 | 5.50 ± 1.80 |
| % Flow limitation/TST | 68.6 ± 11.3 | 5 ± 5* |
*p<0.05 compared to UARS group.
BMI, body mass index; TST, total sleep time; HF, high-frequency power; LF, low-frequency power; PPGres, respiratory-related PPG oscillation.