Characteristics of study subjects
| Patients with OSA | Healthy controls | |||||
| Mean (95% CI) | Mean (95% CI) | |||||
| Group | London (n=34) | Melbourne (n=26) | Total (n=60) | London (n=35) | Melbourne (n=25) | Total (n=60) |
| Age (years) | 49.3 (44.9 to 53.7) | 44.6 (40.7 to 48.5) | 47.3 (44.2 to 50.3) | 48.9 (45.0 to 52.9) | 42.0 (38.4 to 45.7) | 46.1 (43.2 to 49.0) |
| BMI (kg/m2)* | 31.4 (29.9 to 32.9) | 32.6 (31.0 to 34.3) | 32.0 (30.9 to 33.1) | 24.7 (23.4 to 26.0) | 25.3 (24.1 to 26.5) | 25.0 (24.1 to 25.9) |
| AHI (events/h)* | 41.6 (33.2 to 49.9) | 71.5 (65.0 to 77.9) | 55.0 (48.3 to 61.6) | 2.1 (1.3 to 2.9) | 5.3 (3.8 to 6.9) | 4.1 (3.0 to 5.1) |
| ODI (events/h)* | 33.0 (24.4 to 41.5 | – | 33.0 (24.4 to 41.5) | 1.1 (0.5 to 1.7) | – | 1.1 (0.5 to 1.7) |
| ESS* | 13.0 (11.2 to 14.7) | 13.5 (11.9 to 15.2) | 13.2 (12.1 to 14.4) | 4.8 (3.1 to 6.4) | 5.0 (3.7 to 6.3) | 4.9 (3.9 to 5.9) |
↵* Significant difference between OSA patients and healthy controls (p<0.001). Normality was checked using SPSS ‘normality plots.spv’. The plots appeared approximately normally distributed so independent sample t test statistics were used to compare patients and controls.
AHI, apnoea/hypopnoea index; BMI, body mass index; ESS, Epworth sleepiness scale; ODI, oxygen desaturation index; OSA, obstructive sleep apnoea. Bold type indicates data from all patients (n=60), and all healthy controls (n=60).