Holmes and Rahe Stress Scale
Psychological scale
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Through Stress (biology), Disease and Japan
Development
In 1967, psychiatrists Thomas Holmes and Richard Rahe examined the medical records of over 5,000 medical patients as a way to determine whether stressful events might cause illnesses. Patients were asked to tally a list of 43 life events based on a relative score. A positive Correlation and dependence correlation of 0.118 was found between their life events and their illnesses.
Their results were published as the Social Readjustment Rating Scale (SRRS), known more commonly as the Holmes and Rahe Stress Scale. Subsequent validation has supported the links between stress and illness.
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Subsequent research
Rahe carried out a study in 1970 testing the validity of the stress scale as a predictor of illness. The scale was given to 2,500 US sailors and they were asked to rate scores of 'life events' over the previous six months. Over the next six months, detailed records were kept of the sailors' health. There was a +0.118 correlation between stress scale scores and illness, which was sufficient to support the hypothesis of a link between life events and illness.
In conjunction with the Cornell medical index assessing, the stress scale correlated with visits to medical dispensaries, and the H&R stress scale's scores also correlated independently with individuals dropping out of stressful underwater demolitions training due to medical problems. The scale was also assessed against different populations within the United States (with African, Mexican and White American groups). The scale was also tested cross-culturally, comparing Japanese and Malaysian groups with American populations.
A 1975 article in Journal of Human Stress (Behavioral Medicine) by psychologist David Mechanic noted the Holmes stress inventory had proved useful but also identified several limitations, including:
- Lack of differentiation between favorable versus adverse life events
- Ambiguity of life events described
- Confounding dependent and independent variables
- Lack of specificity in items listed
Adults
The sum of the life change units of the applicable events in the past year of an individual's life gives a rough estimate of how stress affects health.
Score of 300+: At risk of illness.
Score of 150-299: Risk of illness is moderate (reduced by 30% from the above risk).
Score < 150: Slight risk of illness.
Non-adults
A modified scale has also been developed for non-adults. Similar to the adult scale, stress points for life events in the past year are added and compared to the rough estimate of how stress affects health.
Score of 300+: At risk of illness.
Score of 150-299: Risk of illness is moderate. (reduced by 30% from the above risk)
Score < 150: Slight risk of illness.