Demographics
| Characteristic | Total n=94 | No EDS n=37 | EDS n=57 | p-value |
| Age years | 50.5±12.8 | 51.5±13.8 | 49.8±12.2 | 0.52 |
| Sex male | 47 (52.8%) | 20 (54.1%) | 27 (51.9%) | 0.84 |
| Body mass index kg·m−2 | 35.9±9.4 | 35.2±6.9 | 36.3±10.7 | 0.54 |
| Apnoea–hypopnoea index | 32.0±26.1 | 27.9±21.7 | 34.6±28.5 | 0.20 |
| Current smoker | 13 (13.8%) | 4 (10.8%) | 9 (15.8%) | 0.55 |
| Epworth Sleepiness Scale (0–24) | 11.0±5.3 | 5.4±2.3 | 14.6±3.2 | <0.01 |
| Overnight | 33 (35.1%) | 11 (29.7%) | 22 (38.6%) | 0.51 |
| Home | 61 (64.9%) | 26 (70.3%) | 35 (61.4%) | 0.51 |
Data are presented as mean±sd; categorical variables are presented as n (%). EDS: excessive daytime sleepiness. A two-sample t-test or Wilcoxon rank-sum test was used for continuous variables, and a Chi-squared or Fisher's exact test was used for categorical variables. Some reported characteristics are missing values which were excluded from the total summary data.