Type A and Type B behaviour.
Friedman and Rosenman suggested that individuals could be separated into two behavioural categories - type A and B. They proposed that Type A individuals were particularly at risk from stress based disordders.
Type A characteristics include: strong drive to suceed, hostility and aggression, competitiveness, perfectionism, desire for recognition, wealth and advancement, difficulty talking about feelings, sense of urgency and impatience.
Type B characteristics include: patient, relaxed, easy going and calm, lacks sense of ungency, lots of self control, do not get irritated or angry easily, less competitive.
- Studied 3454 middle aged men from the USA.
- They were categorised as either Type A or Type B by using a stuctured interview.
- The interviewer also noted down behavioural signs of Type A eg. rapid finger tapping on the table, restlessness and pace of talking.
- Pt's followed up 8 and a half years later.
- During that time, there had been 257 heart attacks, 69% of which were in the Type A category.
- This was a significant effect even when lifestyle risk factors such as smoking/obesity were controlled for.
- Rosenman concluded that high Type A individuals suffer more from stress and are also therefore more vulnerable to heart disease.
- -ve: there are issues of gender bias and cultural bias as the study only used men from the USA.
- -ve: there are many individual and lifestyle variables that can effect vulnerability to heart disease. Although some of these were controlled, some could have been missed.
- +ve: high ecological validity as the study was real life (let go about normal life for 8 and a half years)
- Correlations are never high - they show a link between the type A and stress but this link is never strong.
- It's correlational so you can't establish cause and effect so we cant say being type A causes CHD, just that…