Table 2.
Changes in blood pressure and other confounding factors with severity of apnoea. Values are mean (SD) unless stated otherwise
| Variable | Severity of apnoea*
|
|||
|---|---|---|---|---|
| Controls (n=1249) | Mild apnoea (n=755) | Moderate apnoea (n=308) | Severe apnoea (n=363) | |
| Age (years) | 45.9 (12.7) | 50.6 (12.0) | 51.9 (11.9) | 50.8 (12.2) |
| % Males | 61.5 | 78.0 | 86.4 | 89.3 |
| Body mass index | 28.5 (5.9) | 30.6 (6.3) | 32.9 (6.9) | 35.4 (7.7) |
| Neck circumference | 38.5 (4.1) | 40.7 (3.7) | 42.5 (3.9) | 44.5 (4.2) |
| Waist:hip ratio | 0.92 (0.09) | 0.96 ( 0.07) | 0.99 (0.06) | 1.01 (0.06) |
| Pack years of smoking | 10.9 (17.7) | 13.4 (18.7) | 14.4 (19.2) | 14.6 (18.9) |
| Lowest oxygen saturation | 86.2 (5.9) | 80.2 (9.4) | 74.8 (11.2) | 62.7 (18.8) |
| Mean oxygen saturation | 93.2 (2.0) | 92.2 (2.8) | 91.2 (2.9) | 88.0 (5.7) |
| % Time spent below 90% saturation | 6.2 (14.8) | 14.5 (22.2) | 26.4 (25.8) | 45.3 (28.6) |
| % Hypertensive | 22.8 | 36.5 | 46.0 | 53.6 |
| % Antihypertensive drug use | 13.8 | 23.0 | 30.1 | 29.2 |
| Morning systolic blood pressure | 118.1 (16.9) | 124.8 (18.4) | 128.5 (18.7) | 133.4 (18.7) |
| Morning diastolic blood pressure | 70.1 (10.4) | 73.6 (10.6) | 76.1 (10.7) | 78.8 (11.5) |
*
Controls, non-apnoeic patients (apnoea-hypopnoea index ⩽10); mild apnoea (>10 and <31), moderate apnoea (>30 and <51), and severe apnoea (>50).