Basic characteristics and QT-corrected interval dispersion (QTcd) in moderate–severe obstructive sleep apnoea syndrome (OSAS) patients and controls
| Controls (AHI <5) | OSAS (AHI ≥15) | p-value# | |
| Subjects n | 20 | 29 | |
| Male | 11 (55) | 16 (55) | ns |
| Female | 9 (45) | 13 (45) | ns |
| Age yrs | 45.0±4.6 | 45.8±5.1 | ns |
| BMI kg·m−2 | 28.3±3.4 | 29.7±3.1 | ns |
| BPs mmHg | 111.0±8.0 | 118.2±7.7 | ns |
| BPd mmHg | 74.5±3.3 | 78.4±4.2 | ns |
| HR beats·min−1 | 78.3±8.1 | 79.5±10.0 | ns |
| AHI per hour | 3.2±1.6 | 42.4±17.6 | <0.0001 |
| DI per hour | 9.6±4.7 | 31.5±17.1 | <0.0001 |
| Min. Sa,O2 % | 84.8±5.7 | 73.9±13.8 | <0.0001 |
| Average Sa,O2 % | 94.1±3.2 | 80.1±9.0 | <0.0001 |
| Sleep duration Sa,O2 <90% % | 1.5 | 53.6 | <0.0001 |
| QTcd ms | 36.3±4.5 | 56.1±9.3 | <0.001 |
Data are presented as n (%) or mean±sd, unless otherwise stated. AHI: apnoea–hypopnoea index; BMI: body mass index; BPs: systolic blood pressure; BPd: diastolic blood pressure; HR: heart rate; DI: desaturation index; min.: minimum; Sa,O2: nocturnal arterial oxygen saturation. #: using the Mann-Whitney U-test. ns: nonsignificant.