The number (n) of patients from a population of 386 referred to a lipid clinic to whom the various charts or tables could be applied, whose risk was correctly classified according to the Framingham risk equation12 on which they are all based.
| n | Correct (%) | Underestimated (%) | Overestimated (%) | |
| Joint British charts (Heart version)2 | 340 | 87.9 | 5.0 | 7.1 |
| Joint British charts (BMJ version)13 | 307 | 88.3 | 5.5 | 6.2 |
| New Zealand charts16 | 230 | 63.0 | 2.2 | 34.8 |
| Joint European charts6 | 262 | 65.6 | 6.5 | 27.9 |
| New Sheffield tables17 | 322 | 81.1 | 5.9 | 13.0 |
Coronary heart disease risk was calculated using the Framingham risk equation12 except in the case of the New Zealand charts when cardiovascular risk, which they are designed to predict, was calculated.
The percentages are for the patients (n) to whom the charts or tables could be applied.