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British Regional Heart Study: cardiovascular risk factors in middle-aged men in 24 towns
Insights
Cardiovascular disease risk factors like smoking, alcohol, and blood pressure vary geographically in Britain. Social class influences these factors, contributing to higher cardiovascular disease risk in manual workers.
Area of Science:
- Cardiovascular epidemiology
- Public health research
Background:
- Geographic variations in cardiovascular disease (CVD) prevalence exist in Britain.
- Understanding risk factors and their interrelationships is crucial for public health interventions.
Purpose of the Study:
- To identify cardiovascular disease risk factors in Britain.
- To examine the interplay between these risk factors.
- To explain regional disparities in CVD.
Main Methods:
- A clinical survey of 40-59 year old men across 24 British towns.
- Analysis of preliminary survey data to identify associations.
Main Results:
- Town-level CVD mortality correlated with mean systolic blood pressure, heavy smoking, and heavy alcohol consumption.
- Body mass index, total cholesterol, and HDL cholesterol showed no town-level association with CVD mortality.
- Smoking, alcohol, and systolic blood pressure linked to town's social class, potentially increasing CVD risk for manual workers.
- Individual blood pressure influenced by age, body mass index, and alcohol intake; BMI had a stronger effect.
- Town-level blood pressure variations more associated with heavy drinking prevalence than BMI.
- Unexplained "town" factors contributed to significant differences in mean blood pressure readings.
Conclusions:
- Cigarette smoking, alcohol consumption, and systolic blood pressure are key town-level risk factors for cardiovascular disease.
- Social class plays a role in the distribution of these risk factors.
- While individual factors like BMI and alcohol affect blood pressure, town-level variations in blood pressure are complex and not fully explained by these factors alone.
Abstract:
The British Regional Heart Study seeks to define risk factors for cardiovascular disease, to examine their interrelationships, and to explain the geographic variations in cardiovascular disease in Britain. A clinical survey of men aged 40-59 in 24 British towns was carried out and preliminary data from the survey analysed. On a town basis cardiovascular mortality was associated with mean systolic blood pressure and the prevalence of heavy cigarette smoking and heavy alcohol consumption. No such association was seen for body mass index or mean serum total cholesterol or high-density-lipoprotein cholesterol concentration. Cigarette smoking and alcohol intake and, to a less degree, systolic blood pressure were related to the social class (percentage of manual workers) of a town, and these factors may determine to some extent the increased risk of cardiovascular disease in manual workers. Blood pressure in individual subjects was affected predominantly by age, body mass index, and alcohol intake. Body mass index appeared to affect blood pressure to a greater extent than alcohol intake and did so with a consistent and positive linear trend. Nevertheless, the differences between towns in mean blood pressure readings appeared to be more closely associated with variations in the prevalence of heavy drinking than with variations in body mass index. Alcohol intake and body mass index explained only a part of the striking differences between towns in mean blood pressure readings, and some important "town"factors remained unexplained.