Table 3.
Classification into risk/treatment group, before and after simulated rounding of blood pressure according to overall Framingham CVD risk, and BHS–IV and JBS2 guidelines.
| Framingham risk, all CVD (10 year %) | Framingham risk score after rounding: <20% | Framingham risk score after rounding: ≥20% | Totals before rounding |
| Framingham risk score before rounding: <20% | 5511 | 88a | 5599 (74.2%) |
| Framingham risk score before rounding: ≥20% | 94a | 1849 | 1943 (25.8%) |
| Totals after rounding | 5605 (74.3%) | 1937 (25.7%) | 7542 (100.0%) |
| BHS–IV | BHS–IV after rounding: no drug treatment | BHS–IV after rounding: for drug treatment | Totals before rounding |
| BHS–IV before rounding: no drug treatment | 5210 | 599a | 5809 (77.0%) |
| BHS–IV before rounding: for drug treatment | 34a | 1699 | 1733 (23.0%) |
| Totals after rounding | 5244 (69.5%) | 2298 (30.5%) | 7542 (100.0%) |
| JBS2 | JBS2 after rounding: no drug treatment | JBS2 after rounding: for drug treatment | Totals before rounding |
| JBS2 before rounding: no drug treatment | 4334 | 339a | 4673 (62.0%) |
| JBS2 before rounding: for drug treatment | 56a | 2813 | 2869 (38.0%) |
| Totals after rounding | 4390 (58.2%) | 3152 (41.8%) | 7542 (100.0%) |
Only those originally recorded without zero end-digit and with no history of cardiovascular disease (CVD) are included (n = 7542).
a
Figures in bold represent those whose treatment category changes with rounding. BHS–IV = British Hypertension Society guidelines = BHS–IV; JBS2 = 2005 Joint British Societies' Guidelines on the Prevention of Cardiovascular Disease.