Application of Framingham risk estimates to ethnic minorities in United Kingdom and implications for primary prevention of heart disease in general practice : cross sectional population based study
Objective To compare the 10 year risk of coronary
heart disease (CHD), stroke, and combined
cardiovascular disease (CVD) estimated from the
Framingham equations.
Design Population based cross sectional survey.
Setting Nine general practices in south London.
Population 1386 men and women, age 4059 years,
with no history of CVD (475 white people, 447 south
Asian people, and 464 people of African origin), and
a subgroup of 1069 without known diabetes, left
ventricular hypertrophy, peripheral vascular disease,
renal impairment, or target organ damage.
Main outcome measures 10 year risk estimates.
Results People of African origin had the lowest 10
year risk estimate of CHD adjusted for age and sex
(7.0%, 95% confidence interval 6.5 to 7.5) compared
with white people (8.8%, 8.2 to 9.5) and south Asians
(9.2%, 8.6 to 9.9) and the highest estimated risk of
stroke (1.7% (1.5 to 1.9), 1.4% (1.3 to 1.6), 1.6% (1.5 to
1.8), respectively). The estimate risk of combined
CVD, however, was highest in south Asians (12.5%,
11.6 to 13.4) compared with white people (11.9%,
11.0 to 12.7) and people of African origin (10.5%, 9.7
to 11.2). In the subgroup of 1069, the probability that
a risk of CHD >15% would identify risk of combined
CVD >20% was 91% in white people and 81% in
both south Asians and people of African origin. The
use of thresholds for risk of CHD of 12% in south
Asians and 10% in people of African origin would
increase the probability of identifying those at risk to
100% and 97%, respectively.
Conclusion Primary care doctors should use a lower
threshold of CHD risk when treating mild
uncomplicated hypertension in people of African or
south Asian origin
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