Table 2.
Demographics and QT variables Stratified by Presence of Sleep Disordered Breathing.
| No SDB (n = 165) | SDB(n = 616) | P-value | |
|---|---|---|---|
| Age, years, mean (SD) | 67.1 (9.93) | 67.8 (9.9) | 0.795 |
| Men, no. % | 47 (28.5) | 332 (53.9) | <0.001 |
| Race, no. (%) | |||
| White | 151 (91.5) | 563 (91.4) | 0.976 |
| Black | 11 (6.7) | 41 (6.7) | |
| Other | 3 (1.8) | 12 (1.9) | |
| BM1, kg/m2, mean (SD) | 26.2 (3.57) | 27.3 (4.5) | 0.013 |
| Waist Circumference, cm, mean (SD) | 91.0 (12.8) | 96.2 (12.1) | 0.014 |
| Neck Circumference, mean (SD) | 35.7 (3.39) | 37.9 (3.8) | <0.001 |
| Smoking Status, no. (%) | |||
| Never | 90 (54.5) | 286 (46.4) | 0.256 |
| Current | 10 (6.1) | 49 (8.0) | |
| Former | 65 (39.4) | 281 (45.6) | |
| Hypertension, no. (%) | 66 (40.0) | 285 (46.3) | <0.001 |
| Diabetes, no. (%) | 12 (7.3) | 46 (7.5) | 0.594 |
| Cardiovascular Disease, no. (%) | 20 (12.1) | 67 (10.9) | 0.662 |
| Dead, no. (%) | 45 (27.3) | 177 (28.7) | <0.001 |
| QTc intervala | 422 (29.3) | 415 (31.7) | 0.002 |
| Standard deviation of QT interval (SDQT), mean (SD) | 6.84 (9.31) | 9.45 (12.4) | 0.014 |
| Normalized QT interval variance (QTVN), mean (SD) | 0.0010 (0.004) | 0.0014 (0.005) | 0.024 |
| The short-term interval beat-to-beat QT variability (STVQT), mean (SD) | 3.11 (2.04) | 3.84 (3.9) | 0.055 |
a
QTc = QT interval with Bazett’s heart rate correction.