BMJ 1997;315:722-729 (20 September)
General practice
Comparison of the prediction by 27 different factors of coronary heart disease and death in men and women of the Scottish heart health study: cohort study
Hugh Tunstall-Pedoe,
professor and director,a
Mark Woodward,
senior lecturer
in statistical epidemiology,a
Roger Tavendale,
biochemist,a
Richard A' Brook,
research assistant,a
Mary K McCluskey,
research
assistant aa Cardiovascular Epidemiology Unit, Ninewells Hospital and Medical School, Dundee DD1 9SY
Correspondence to: Professor Tunstall-Pedoe h.tunstallpedoe@dundee.ac.uk
Objective: To compare prediction by 27 different
factors in men and women of coronary heart disease events, coronary deaths, and deaths from
all causes.
Design: Cohort study.
Setting: Scottish population study.
Subjects: In 1984-7 random sampling of
residents aged 40-59 produced 11 629 men and women who generated survey clinic
questionnaires, examination findings, and blood and urine specimens.
Main outcome measures: Subsequent death,
coronary artery surgery, and myocardial infarction. Risks were calculated for each category of
factor or fifth of continuous variables. 27 factors were ranked by descending age adjusted hazard
ratio of the top to bottom class in each factor, by sex and end point.
Results: Follow up averaged 7.6 years, during
which the 5754 men had 404 coronary events, 159 coronary deaths, and 383 deaths and the 5875
women 177, 47, and 208 respectively. The rankings for factors for the three end points were
mainly similar in men and women, although hazard ratios were often higher in women. Classical
risk factors ranked better for predicting coronary risk than newer ones. Yet strong prediction of
coronary risk was no guarantee of significant prediction of all cause mortality. Findings included
an anomalous coronary protective role for type A behaviour in women; raised plasma fibrinogen
as a strong predictor of all end points; and an unexpectedly powerful protective relation of dietary
potassium to all cause mortality.
Conclusions: These initial unifactorial rankings and
comparisons must be interpreted with caution until potential interaction, confounding, and
problems of measurement and causation are further explored.
|
Key messages
- Among Scottish men and women studied for 27 risk factors for coronary heart disease and
followed up for eight years classical risk factors scored strongly in predicting coronary risk but
the performance of new ones was more variable
- Risk factors for coronary disease, and also for death, showed few, albeit interesting,
differences between men and women
- Relative risk was often higher for risk factors in women but they had low levels of
absolute risk when risk factor levels were low
- Smoking, blood pressure, and fibrinogen predicted coronary disease and also death, but
other factors are less consistent
- Unifactorial results should not be overinterpreted, but the protective effect of potassium
consumption is of particular interest
|

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