| Younger males | Older males | |
| Subjects n | 14 | 11 |
| Age years | 28 (26–32) | 65 (63–69) |
| Height m | 1.8 (1.7–1.8) | 1.8 (1.7–1.9) |
| Body mass index kg·m−2 | 26 (24–27) | 27 (25–29) |
| Neck circumference cm | 39 (38–41) | 40 (39–40) |
| Epworth sleepiness score# | 6 (3–8) | 5 (4–6) |
Data are presented as median (interquartile range), unless otherwise stated. There were no significant differences (p=0.05) between groups for any parameter (except for age). #: out of a total possible score of 24.