In a mass screening 1,329 men aged 40-59 years were examined with regard to serum cholesterol and systolic blood pressure, and then followed over a 6-year period for the development of coronary heart disease (CHD). At the beginning of the period all were free from CHD.
| Systolic Blood pressure (mm Hg) | ||||||
| < 147 | 147-166 | ³167 | ||||
| (Serum cholesterol mg/100 ml) |
# Men | #Men with CHD | # Men | #Men with CHD | # Men | #Men with CHD |
| < 220 | 431 | 10 | 93 | 3 | 49 | 7 |
| 220 - 259 | 347 | 19 | 74 | 6 | 49 | 6 |
| ³ 260 | 185 | 19 | 57 | 11 | 44 | 11 |
Consider the following groups:
Calculate the relative risk of coronary heart disease in relation to group (a) for group (b).