Characteristics of the study population
| Variable | n | Min | LQ | Median | UQ | Max | R2† |
|---|---|---|---|---|---|---|---|
| *Of which 52.4% were female and 36.1% were classified as hypertensive; †proportion of variability explained by correction for environmental variables (that is, age, gender, alcohol consumption, smoking behaviour, exercise taken). All variables were log transformed before correction except WHR. This was done to approximately normalise the distributions. | |||||||
| LQ, quartile; UQ, upper quartile; WHR, waist to hip ratio. | |||||||
| Age (years) | 1425* | 18.7 | 35.7 | 50.9 | 60.9 | 90.7 | – |
| BMI (kg/m2) | 1402 | 16.7 | 23.1 | 25.4 | 28.2 | 51.8 | 15.2 |
| WHR | 1357 | 0.56 | 0.78 | 0.85 | 0.91 | 1.22 | 48.7 |
| Plasma leptin (ng/μl) | 1319 | 1.1 | 4.6 | 8.6 | 15.3 | 116.6 | 46.4 |
| Daytime systolic (mm Hg) | 958 | 94.2 | 121.1 | 131 | 144.1 | 214.0 | 20.4 |
| Daytime diastolic (mm Hg) | 958 | 54.0 | 72.0 | 78.6 | 88.0 | 119.9 | 17.9 |
| Daytime pulse pressure (mm Hg) | 958 | 29.0 | 45.0 | 51.4 | 58.4 | 105.0 | 14.2 |
| Clinic pulse pressure (mm Hg) | 928 | 24.0 | 43.7 | 50.5 | 60.9 | 112.0 | 21.8 |
| Nighttime pulse pressure (mm Hg) | 770 | 9.0 | 40.0 | 46.0 | 52.7 | 86.0 | 4.5 |
| Mean IMT (mm) | 854 | 0.42 | 0.65 | 0.76 | 0.91 | 2.17 | 38.9 |
| Max IMT (mm) | 856 | 0.44 | 0.71 | 0.83 | 1.00 | 2.53 | 37.3 |