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More Weinman
Patients’ Perceptions of Their Illness: The Dynamo of Volition in Health Care
https://www.fmhs.auckland.ac.nz/assets/fmhs/som/psychmed/petrie/docs/2012-dynamo-of-volition.pdf
A text message programme designed to modify patients’ illness and treatment beliefs improves
self-reported adherence to asthma preventer medication
https://www.fmhs.auckland.ac.nz/assets/fmhs/som/psychmed/petrie/docs/2011-text-message-asthma.pdf
Note that in the above studies, treatment adherence was self-reported, ie on the phone. So factors such as social desirability bias (eg participating in a trial, you'd be expected to increase reporting) are in play. The problem is they didn't use objective outcome measures - so there is no direct evidence that such increased adherence reporting was associated with improved health outcomes.
The authors actually preference beliefs over objective outcomes:
ie they believe that subjectively reported outcomes (including the many biases that go into such reporting) are more important than objective outcomes of health. They present an interesting hypothesis claiming that beliefs of greater severity led to poorer outcomes in several studies. But yet there is a surprising lack of evidence that modifying these beliefs led to improved objective measures of functioning except in one (Petrie) study (Illness perception intervention for myocardial infarction patients), which found that the intervention group went back to work a few days earlier, but by 3 months, there was no significant difference (6 months results not reported):
(52 intervention, 51 control (Intention To Treat), 33 in each group at this specific follow up at 3 months)
Patients’ Perceptions of Their Illness: The Dynamo of Volition in Health Care
https://www.fmhs.auckland.ac.nz/assets/fmhs/som/psychmed/petrie/docs/2012-dynamo-of-volition.pdf
A text message programme designed to modify patients’ illness and treatment beliefs improves
self-reported adherence to asthma preventer medication
https://www.fmhs.auckland.ac.nz/assets/fmhs/som/psychmed/petrie/docs/2011-text-message-asthma.pdf
Note that in the above studies, treatment adherence was self-reported, ie on the phone. So factors such as social desirability bias (eg participating in a trial, you'd be expected to increase reporting) are in play. The problem is they didn't use objective outcome measures - so there is no direct evidence that such increased adherence reporting was associated with improved health outcomes.
The authors actually preference beliefs over objective outcomes:
Petrie & Weinman 2012: Patients’ Perceptions of Their Illness: The Dynamo of Volition in Health Care said:While it seems possible that negative perceptions are indicative of poorer prognosis, studies have generally found that illness perceptions not only fail to relate closely to objective measures of disease severity but also are often better predictors of outcome.
ie they believe that subjectively reported outcomes (including the many biases that go into such reporting) are more important than objective outcomes of health. They present an interesting hypothesis claiming that beliefs of greater severity led to poorer outcomes in several studies. But yet there is a surprising lack of evidence that modifying these beliefs led to improved objective measures of functioning except in one (Petrie) study (Illness perception intervention for myocardial infarction patients), which found that the intervention group went back to work a few days earlier, but by 3 months, there was no significant difference (6 months results not reported):
(52 intervention, 51 control (Intention To Treat), 33 in each group at this specific follow up at 3 months)
Petrie 2009 said:The difference between groups in the proportions working or not working (either part- or full time) was not statistically significant
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