| Variable | Overall patients (n = 51) | Stage I hypertensives (n = 36) | Stage II hypertensives (n = 15) | p valuea | |
| Gender | |||||
| Male, n (%) | 30 (58.8) | 17 (47.2) | 13 (86.7) | <0.05 | |
| Female, n (%) | 21 (41.2) | 19 (52.8) | 2 (13.3) | ||
| Systolic blood pressure in mmHg, mean ± SD | 156.7 ± 2 | 152 ± 3 | 168 ± 5 | <0.05 | |
| Diastolic blood pressure in mmHg, mean ± SD | 96.9 ± 3 | 94 ± 5 | 104 ± 6 | <0.05 | |
| Symptoms of sleep-disordered breathing | |||||
| No symptoms, n (%) | 24 (47.1) | 20 (55.5) | 4 (26.7) | <0.05 | |
| Disruptive snoring, n (%) | 22 (43.1) | 13 (36.1) | 9 (60.0) | <0.05 | |
| Frequent awakenings, n (%) | 10 (19.6) | 6 (16.7) | 4 (26.7) | <0.05 | |
| Morning headaches, n (%) | 18 (35.3) | 10 (27.8) | 8 (53.3) | <0.05 | |
| Excessive daytime sleepiness, n (%) | 11 (21.6) | 6 (16.7) | 5 (33.3) | <0.05 | |
| Self-reported apneas, n (%) | 6 (11.8) | 2 (5.6) | 4 (26.7) | <0.05 | |
| Duration of symptoms of sleep-disordered breathing | |||||
| Asymptomatic, n (%) | 24 (47.1) | 20 (55.5) | 4 (26.7) | 0.05 | |
| <6 months, n (%) | 5 (9.8) | 4 (11.1) | 1 (6.7) | <0.05 | |
| 6 - 12 months, n (%) | 9 (17.6) | 5 (13.9) | 4 (26.7) | n.s. | |
| >12 months, n (%) | 13 (25.5) | 7 (19.4) | 6 (40.0) | <0.05 | |
| Epworth Sleepiness Scale (ESS) score | |||||
| 0 - 10 [No chances of dozing], n (%) | 25 (49.0) | 21 (58.3) | 4 (26.7) | n.s. | |
| 11 - 14 [Slight chances of dozing], n (%) | 13 (25.5) | 8 (22.2) | 5 (33.3) | n.s. | |
| 15 - 18 [Moderate chances of dozing], n (%) | 7 (13.7) | 4 (11.1) | 3 (20.0) | n.s. | |
| 19 - 24 [High chances of dozing], n (%) | 6 (11.8) | 3 (8.3) | 3 (20.0) | <0.05 | |
| Total sleep time in minutes, mean ± SD | 282.6 ± 32.6 | 288.5 ± 37.9 | 268.3 ± 27.9 | n.s. | |
| Sleep latency time in minutes, mean ± SD | 12.4 ± 0.90 | 12.5 ± _0.80 | 12.2 ± 0.86 | n.s. | |
| REM sleep latency time in minutes, mean ± SD | 111.2 ± 0.8 | 109.9 ± 0.78 | 114.4 ± 0.67 | <0.05 | |
| Snore time in minutes, mean ± SD | 95.9 ± 32.1 | 90.8 ± 32.1 | 108.6 ± 29.5 | <0.05 | |
| Apnea Hypopnea Index (AHI) score | |||||
| <5 events/hour, n (%) | 14 (27.5) | 11 (30.5) | 3 (20.0) | n.s. | |
| 5- < 15 events/hour, n (%) | 25 (49.0) | 19 (52.8) | 6 (40.0) | n.s. | |
| 15- < 30 events/hour, n (%) | 9 (17.6) | 5 (13.9) | 4 (26.7) | n.s. | |
| ≥30 events/hour, n (%) | 3 (5.9) | 1 (2.8) | 2 (13.3) | n.s. | |
| AHI (events per hour), mean ± SD | 10.08 ± 7.4 | 8.48 ± 5.8 | 13.9 ± 9.5 | n.s. | |
| Patients with nocturnal oxygen desaturation, n (%) | 17 (33.3%) | 9 (25.0) | 8 (53.3) | n.s. | |
| Lowest oxygen saturation levels, mean ± SD | 89.7 ± 6.0 | 90.9 ± 4.8 | 85.6 ± 7.0 | <0.05 | |
| C-reactive protein levels in mg/dL, mean ± SD | 0.81 ± 0.08 | 0.73 ± 0.06 | 0.99 ± 0.1 | <0.05 | |