| Non-sleepy group | Sleepy group | p Value | |
| Years from diagnosis (mean) | 6.07 ± 0.63 | 5.47 ± 0.98 | ns |
| ESS at diagnosis (median) | 13 (3–22) | 18 (7–24) | 0.0015 |
| Change in ESS | −7.5 (−21–5) | −3 (−11–7) | 0.04 |
| Mean BMI (kg/m2) at diagnosis | 35.1 ± 1.04 | 36.3 ± 2.12 | ns |
| Change in BMI | −1 ± 0.47 | −0.7 ± 0.31 | ns |
| Mean AHI/h | 45.1 ± 3.37 | 57.9 ± 6.3 | 0.06 |
| Mean compliance in last 12 months (h/night) | 5.99 ± 0.34 | 6.58 0.35 | ns |
| Empirical change from initial CPAP pressure, n (%) | 13/40 (32.5%) | 10/19 (52%) | 0.055 |
| Median current CPAP pressure (mm Hg) | 10 (6–15.6) | 12 (8–16) | 0.054 |
| Snorer on CPAP, n (%) | 2/40 (5%) | 9/19 (47%) | 0.006 |
| Patient on at least 1 drug causing drowsiness, n (%) | 11/40 (27.5%) | 11/19 (57.8%) | 0.049 |
AHI, apnoea/hypopnoea index; BMI, body mass index; CPAP, continuous positive airways pressure; ESS, Epworth sleepiness score.