Comparison of baseline parameters between patients who were randomised and those who refused to participate in the study
| Randomised (n = 56) | Refused (n = 44) | p value | |
|---|---|---|---|
| AHI, apnoea-hypopnoea index; BMI, body mass index; ESS, Epworth Sleepiness Scale; Sao2, oxygen saturation; TST, total sleep time; Sao2 <90 (TST %) = % of total sleep time with oxygen saturation <90%; MAP, mean arterial blood pressure. | |||
| Values are expressed as mean (SE). | |||
| *χ2 test. | |||
| †Fisher’s exact test. | |||
| M/F | 43/13 | 35/9 | 0.811† |
| Age (years) | 50.8 (1.7) | 48.8 (1.4) | 0.281 |
| Neck circumference (cm) | 38.5 (0.4) | 39.2 (0.8) | 0.454 |
| Waist circumference (cm) | 94.1 (1.4) | 96.1 (2.4) | 0.447 |
| BMI (kg/m2) | 27.2 (0.5) | 28.1 (0.7) | 0.239 |
| ESS score | 11.1 (0.7) | 9.8 (0.8) | 0.230 |
| Smoking status | 0.129* | ||
| Never | 43 | 20 | |
| Quit | 8 | 8 | |
| Current | 5 | 7 | |
| Alcohol consumption | 0.101* | ||
| Never | 34 | 15 | |
| Quit | 4 | 1 | |
| Current | 18 | 19 | |
| Hypertension | 0.581† | ||
| Yes | 28 | 21 | |
| No | 28 | 21 | |
| AHI (events/hour) | 31.2 (2.2) | 38.4 (4.0) | 0.093 |
| Minimum Sao2 (%) | 74.6 (1.9) | 72.6 (3.1) | 0.556 |
| Mean Sao2 (%) | 93.7 (0.4) | 92.9 (0.9) | 0.363 |
| Arousal index | 31.8 (2.4) | 27.7 (3.2) | 0.297 |
| Sao2 <90 (TST %) | 8.4 (2.4) | 2.9 (1.9) | 0.093 |
| TST (min) | 387.6 (16.1) | 385.3 (27.0) | 0.940 |
| Mean 24 hour BP (mm Hg) | |||
| Systolic | 123.7 (1.8) | 129.3 (2.3) | 0.054 |
| Diastolic | 80.9 (1.2) | 74.1 (1.4) | 0.091 |
| MAP | 95.2 (1.3) | 98.7 (1.5) | 0.087 |
| Wake time BP | |||
| Systolic | 127.8 (1.8) | 132.0 (2.3) | 0.150 |
| Diastolic | 83.6 (1.2) | 85.6 (1.4) | 0.306 |
| MAP | 98.1 (1.5) | 100.2 (1.6) | 0.301 |
| Sleep time BP | |||
| Systolic | 115.7 (2.0) | 119.1 (2.6) | 0.291 |
| Diastolic | 74.8 (1.4) | 76.7 (1.5) | 0.364 |
| MAP | 89.1 (1.5) | 90.7 (1.7) | 0.475 |