Does access to cardiac investigation and treatment contribute to social and ethnic differences in coronary heart disease? Whitehall II prospective cohort study.
OBJECTIVE
To determine whether access to cardiac procedures and drugs contributes to social and ethnic differences in coronary heart disease in a population setting.


METHODS
Prospective study with follow up over 15 years. Civil service employment grade was used as a measure of individual socioeconomic position. Need for cardiac care was determined by the presence of angina, myocardial infarction, and coronary risk factors.


METHODS
20 civil service departments originally located in London.


METHODS
10,308 civil servants (3414 women; 560 South Asian) aged 35-55 years at baseline in 1985-8.


METHODS
Use of exercise electrocardiography, coronary angiography, and coronary revascularisation procedures and secondary prevention drugs.


RESULTS
Inverse social gradients existed in incident coronary morbidity and mortality. South Asian participants also had higher rates than white participants. After adjustment for clinical need, social position showed no association with the use of cardiac procedures or secondary prevention drugs. For example, men in the low versus high employment grade had an age adjusted odds ratio for angiography of 1.87 (95% confidence interval 1.32 to 2.64), which decreased to 1.27 (0.83 to 1.94) on adjustment for clinical need. South Asians tended to be more likely to have cardiac procedures and to be taking more secondary prevention drugs than white participants, even after adjustment for clinical need.


CONCLUSIONS
This population based study, which shows the widely observed social and ethnic patterning of coronary heart disease, found no evidence that low social position or South Asian ethnicity was associated with lower use of cardiac procedures or drugs, independently of clinical need. Differences in medical care are unlikely to contribute to social or ethnic differences in coronary heart disease in this cohort.
Britton
Annie
A
International Centre for Health and Society, Department of Epidemiology and Public Health, University College London Medical School, London WC1E 6BT.
Shipley
Martin
M
Marmot
Michael
M
Hemingway
Harry
H
D000328:Adult; D015331:Cohort Studies; D017023:Coronary Angiography / Q000706:statistics & numerical data; D003327:Coronary Disease / Q000208:ethnology / Q000628:therapy*; D004562:Electrocardiography / Q000706:statistics & numerical data; D005260:Female; D006297:Health Services Accessibility; D006801:Humans; D008297:Male; D008875:Middle Aged; D009204:Myocardial Revascularization / Q000706:statistics & numerical data; D011379:Prognosis; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012307:Risk Factors; D012959:Socioeconomic Factors