Characteristics of unmatched and propensity score matched study population
| Unmatched | Matched | |||
| No cancer | All-cause cancer | No cancer | All-cause cancer | |
| N=59 878 | N=2933 | N=2093 | N=2093 | |
| Sex, females (%) | 17 647 (29.5%) | 903 (30.8%) | 661 (31.6%) | 623 (29.8%) |
| Age, years | 56.8 (12.5) | 65.5 (10.2) | 65.3 (10.2) | 65.3 (10.1) |
| BMI, kg/m2 | 31 (28–35) | 30 (27–34) | 30 (27–34) | 30 (27–34) |
| ESS, units | 10.3 (5.0) | 9.9 (4.9) | 9.6 (4.9) | 10.0 (4.9) |
| Ischaemic heart disease | 5671 (9.5%) | 425 (14.5%) | 311 (14.9%) | 309 (14.8%) |
| Heart failure | 3263 (5.4%) | 277 (9.4%) | 180 (8.6%) | 186 (8.9%) |
| Diabetes mellitus | 8548 (14.3%) | 526 (17.9%) | 360 (17.2%) | 366 (17.5%) |
| OLD | 7610 (12.7%) | 462 (15.8%) | 325 (15.5%) | 327 (15.6%) |
| Civil status | ||||
| Married | 31 926 (53.5%) | 1771 (61.0%) | 1300 (62.1%) | 1280 (61.2%) |
| Unmarried | 14 675 (24.6%) | 392 (13.5%) | 289 (13.8%) | 275 (13.1%) |
| Divorced | 10 561 (17.7%) | 520 (17.9%) | 340 (16.2%) | 378 (18.1%) |
| Widower/widow | 2529 (4.2%) | 219 (7.5%) | 164 (7.8%) | 160 (7.6%) |
| Level of education | ||||
| Low (≤9 years) | 10 547 (21.7%) | 605 (26.1%) | 540 (25.8%) | 546 (26.1%) |
| Medium (10–12 years) | 25 065 (51.5%) | 1061 (45.8%) | 977 (46.7%) | 959 (45.8%) |
| High (≥13 years) | 13 060 (26.8%) | 653 (28.2%) | 576 (27.5%) | 588 (28.1%) |
Matched by anthropometric variables (sex, age, BMI), comorbidities at baseline (ischaemic heart disease, heart failure, diabetes mellitus and obstructive lung disease), socioeconomic factors (civil status and educational level), start year of CPAP treatment and county trichotomised by smoking prevalence. Data are presented as mean (SD) or median (IQR) for continuous measures, and n (%) for categorical measures.
BMI, body mass index; CPAP, continuous positive airway pressure; ESS, Epworth Sleepiness Scale; OLD, obstructive lung disease.