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Friedman and Rosenman
· Interviewed 28 employees about family history of
heart disease, eating habits, work levels, sleep and
exercise. Observed body language, ways of speaking
and were categorised as either type A or B
· Found o difference between stress and CHD levels in
type A and B. Type A had blood clotting time of 6.8
whereas type B had blood clotting time of 7.2. type A
had higher levels of cholesterol than type B. 28% of
type A's were likely to develop CHD compared to 4%
of type B's
· This shows that type A's are more likely to suffer
from CHD…read more

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Friedman and Rosenman- evaluation
· Population validity- only used men so the effects of stress
on CHD may be different for women
· Only looks at personality influences- lots of other
influences upon stress and health such as CHD being
genetic as type A's reported higher levels of CHD in family
· High ecological validity- shows real effects of stress on
CHD. Personality was measured using a range of
approaches (interviews, observations) increasing validity.
· Low Internal validity (confounding variable)- smoking,
lifestyle, diet may be real cause of CHD and not
personality type…read more

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· Asked 13,000 people to complete an anger
· None of the participants suffered CHD before the
· Found that 6 years later, those who scored high on
the anger scale, were 2.6 times more likely to have a
heart attack
· This shows that one aspect of type A behaviour is
enough to put you at risk of getting CHD, which
suggests a link between stress and CHD…read more

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Williams- evaluation
· Type A or aggression?- uncertainty to the actual
cause of CHD, type A behaviour or just aggression, as
only one characteristic of type A behaviour was
tested…read more

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Russek and Zohman
· Studied GP's and dermatologists
· Found that GP's (who were classed as having a highly
stressful job) had a higher rate of heart disease
(11.9%) compared to dermatologists (less stressful
job) of whom only 3.2% had experiences of heart
· This shows that people with highly stressful jobs are
more at risk from CHD, suggesting a link between
stress and CHD…read more

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