Table 1

Summary of patient characteristics in the analytic sample (n=1247) at baseline

Median (IQR)* or N (%)
Age (years)58.3±11.7
Gender (men)1183 (94.9)
Ethnicity (white)978 (80.0)
Employed425 (34.8)
BMI (kg/m2)34.6±7.3
AHI (events/hour)*12.0 (33.6)
AHI (events/hour)25.0±29.7
None/mild OSA (AHI <15)676 (54.2)
Moderate OSA (15≤AHI< 30)198 (15.9)
Severe OSA (AHI≥30)373 (29.9)
CPAP use‡402 (32.9)
Current smoking427 (36.0)
Current alcohol use581 (49.8)
Current drug use67 (5.9)
Home oxygen use87 (7.2)
Hypertension868 (71.0)
Diabetes382 (31.2)
Coronary artery disease§238 (19.5)
Congestive heart failure137 (11.2)
Stroke or TIA100 (8.2)
Prior CVD¶359 (29.0)
Atrial fibrillation98 (8.0)
Renal failure62 (5.1)
Chronic lung disease396 (32.5)
Cancer**115 (9.4)
Depression449 (36.8)
PTSD131 (10.7)
Dementia21 (1.7)
CCI score 0395 (32.6)
CCI score 1–2505 (41.6)
CCI score >2313 (25.8)
FRS*24.2 (22.6)
  • *Median and interquartile ranges are provided for AHI and FRS. All other continuous variables are reported as mean (SD).

  • †ESS score available for 574 or 1247 patients.

  • ‡Regular use (see online supplementary file) among patients eligible for therapy.

  • §Includes myocardial infarction, coronary artery bypass grafting or percutaneous intervention.

  • ¶Includes stroke, TIA, myocardial infarction, coronary artery bypass graft, percutaneous intervention and congestive heart failure.

  • **Includes solid tumours, leukaemia and lymphoma.

  • AHI, apnoea–hypopnoea index; BMI, body mass index; CCI, Charlson comorbidity index; CPAP, continuous positive airway pressure; CVD, cardiovascular disease; ESS, Epworth sleepiness scale; FRS, Framingham risk score; OSA, obstructive sleep apnoea; PTSD, post-traumatic stress disorder; TIA, transient ischaemic attack.