Screening sample | Non-participants | Participants | p-value | |
Subjects n | 3960 | 3670 | 290 | |
Age yrs | 48.8±10.3 | 48.8±10.3 | 48.2±11.2 | 0.357 |
Females | 44.5 | 44.5 | 44.1 | 0.899 |
Higher education | 28.1 | |||
Cohabitation# | 83.3 | |||
BMI kg·m−2 | 29.1±5.2 | 29.1±5.2 | 29.0±4.9 | 0.951 |
Berlin Questionnaire | ||||
Snoring category | 92.3 | 92.4 | 91.0 | 0.412 |
Daytime somnolence category | 63.1 | 62.5 | 70.7 | 0.005 |
Hypertension/obesity category | 66.3 | 66.2 | 66.6 | 0.914 |
Epworth Sleepiness Scale | 8.8±4.5 | 8.8±4.5 | 9.8±4.5 | <0.001 |
EDS¶ | 33.7 | 33.0 | 43.1 | <0.001 |
Frequent depressive thoughts/loss of interest | 15.3 | 15.5 | 12.9 | 0.253 |
Beck Depression Inventory | 8.5±6.9 | |||
Sleep latency min | 11.0 (6.0–21.0) | |||
WASO min | 55.2 (29.2–90.5) | |||
Mean total sleep time min | 413.6±86.7 | |||
Sleep efficiency | 83.2±11.2 | |||
AHI events·h−1 | 7.7 (2.4–22.2) | |||
Obstructive sleep apnoea | 60.5 |
Data are presented as mean±sd, % or median (interquartile range), unless otherwise stated. BMI: body mass index; EDS: excessive daytime sleepiness; WASO: wake after sleep onset; AHI: apnoea/hypopnoea index. #: married or living with partner; ¶: Epworth Sleepiness Scale >10.