Demographic characteristics of study patients (n = 2149)
| No OSA(RDI <5) | Mild OSA(RDI 5–14.9) | Moderate OSA(RDI 15–29.9) | Severe OSA(RDI ⩾30) | All | p Value* | |
| Observations, n (% all) | 432 (20.1) | 738 (34.4) | 443 (20.6) | 536 (24.9) | 2149 (100) | <0.001 |
| Men, n (%) | 197 (45.6) | 463 (62.7) | 281 (63.4) | 405 (75.6) | 1346 (62.6) | <0.001 |
| Mean (SD) age (years) | 44.0 (12.9) | 50.0 (12.5) | 52.8 (12.5) | 53.0 (11.9) | 50.1 (12.9) | <0.001 |
| Median (IQR) BMI (kg/m2) | 27.8 (24.9–32.2) | 30.6 (27.2–35.4) | 32.0 (28.1–36.8) | 34.5 (30.4–39.8) | 31.3 (27.3–36.6) | <0.001 |
| Current smoker, n (%) | 89 (20.6) | 116 (15.8) | 60 (13.5) | 89 (16.6) | 354 (16.5) | 0.11 |
| Mean (SD) neck circumference (in) | 14.9 (1.5) | 15.8 (1.7) | 16.3 (1.7) | 17.1 (1.8) | 16.0 (1.9) | <0.001 |
| Mean (SD) ESS | 10.9 (5.1) | 10.7 (5.3) | 11.4 (5.4) | 12.3 (5.5) | 11.3 (5.4) | <0.001 |
| Diabetes (self-report + medications), n (%) | 19 (4.4) | 40 (5.4) | 33 (7.4) | 82 (15.3) | 174 (8.1) | <0.001 |
| Diabetes (admin algorithm), n (%) | 29 (6.7) | 61 (8.3) | 42 (9.5) | 111 (20.7) | 243 (11.3) | <0.001 |
BMI, body mass index; ESS, Epworth Sleepiness Score; IQR, interquartile range; OSA, obstructive sleep apnoea; RDI, respiratory disturbance index; SD, standard deviation.
*χ2 test, analysis of variance.