Effective continuous positive airway pressure (CPAP) treatment and sham groups baseline characteristics
| Effective CPAP (n = 15) | Sham (n = 15) | p Value | |
| Age (years) | 56.0 (10.1) | 53.1 (10.4) | 0.9 |
| Male gender (%) | 60.0 | 46.0 | 0.4 |
| Body mass index (kg/m2) | 29.6 (6.2) | 30.8 (6.2) | 0.6 |
| Neck circumference (cm) | 37.9 (4.5) | 38.2 (3.5) | 0.8 |
| Hypertension (%, n) | 53.0 (8) | 53.0 (8) | 1 |
| Systolic blood pressure (mm Hg) | 142.3 (19.8) | 138.1 (10.5) | 0.5 |
| Diastolic blood pressure (mm Hg) | 87.2 (12.1) | 81.8 (8.2) | 0.2 |
| Diabetes mellitus (%, n) | 13.0 (2) | 13.0 (2) | 1 |
| Heart rate (beats/min) | 67.8 (13.4) | 68.9 (12.5) | 0.8 |
| Sleep efficiency (%) | 83.8 (7.5) | 86.2 (12.1) | 0.5 |
| Total sleep time (min) | 358.1 (104.5) | 385.2 (49.6) | 0.4 |
| Apnoea-hypopnoea index (events/h) | 39.2 (21.3) | 43.9 (20.1) | 0.5 |
| Microarousal index/h | 18.9 (9.7) | 20.4 (9.6) | 0.7 |
| O2 saturation nadir (%) | 77.4 (18.3) | 79.2 (10.4) | 0.8 |
| Left ventricular mass index (g/m2) | 82.5 (17.6) | 85.6 (14.7) | 0.6 |
| E velocity (cm/s) | 70.7 (13.2) | 60.6 (25.2) | 0.6 |
| A velocity (cm/s) | 69.9 (15.8) | 75.1 (21.1) | 0.5 |
| E/A ratio | 1.0 (0.2) | 1.0 (0.4) | 0.6 |
| E mitral deceleration time (ms) | 227.0 (38.8) | 244.2 (21.3) | 0.1 |
| E/E′ ratio | 10.3 (1.9) | 10.5 (2.6) | 0.8 |
| Averaged E′ velocity (cm/s) | 7.0 (1.5) | 6.6 (1.9) | 0.6 |
| Averaged A′ velocity (cm/s) | 7.8 (2.3) | 7.1 (1.6) | 0.3 |
| E′/A′ ratio | 1.0 (0.4) | 1.0 (0.3) | 0.9 |
| S velocity (cm/s) | 8.2 (1.9) | 7.8 (2.3) | 0.5 |
| 3D LA maximum volume (ml) | 45.2 (11.9) | 46.2 (17.3) | 0.9 |
| 3D LA minimum volume (ml) | 18.0 (5.1) | 18.6 (6.4) | 0.8 |
| 3D volume before LA contraction (ml) | 32.1 (9.5) | 30.8 (13.6) | 0.8 |