Table 1. Characteristics of study participants, Whitehall II, UK, 1991-2004.
| Characteristic* | N | |
|---|---|---|
| Age, y | 7095 | 48.8±5.7 |
| Sex, % | ||
| Male | 4986 | 70.3 |
| Female | 2109 | 29.7 |
| Ethnic group, % | ||
| White | 6465 | 91.1 |
| Non-white | 630 | 8.9 |
| Total cholesterol, mmol/L (mg/dL) | 6802 | 6.45 (249.7)±1.15 (44.5) |
| High-density lipoprotein cholesterol, mmol/L (mg/dL) | 6779 | 1.43 (55.3)±0.41 (15.8) |
| Systolic blood pressure, mm Hg | 6830 | 120.2±13.4 |
| Antihypertensive treatment, % | ||
| No | 6670 | 94.4 |
| Yes | 394 | 5.6 |
| Diabetes, % | ||
| No | 6896 | 97.2 |
| Yes | 199 | 2.8 |
| Smoking, % | ||
| No | 6108 | 86.1 |
| Yes | 985 | 13.9 |
| Working hours per day, % | ||
| 7-8 | 3832 | 54.0 |
| 9 | 1469 | 20.7 |
| 10 | 1058 | 14.9 |
| ≥11 | 736 | 10.4 |
| Mean follow-up, y | 7095 | 11.1±2.7 |
| Incident coronary heart disease at follow-up | ||
| None | 6903 | 97.3 |
| Non-fatal myocardial infarction | 163 | 2.3 |
| Coronary death | 29 | 0.4 |
*
Statistics are mean±SD for continuous variables or percent for categorical variables unless otherwise stated.