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Health: perception versus observationhttp://bmj.com/cgi/content/full/324/7342/860
EditorialsHealth: perception versus observationSelf reported morbidity has severe limitations and can be extremely misleading
Critical scrutiny of public health care and medical strategy depends, among other things, on how individual states of health and illness are assessed. One of the complications in evaluating health states arises from the fact that a person's own understanding of his or her health may not accord with the appraisal of medical experts. More generally, there is a conceptual contrast between "internal" views of health (based on the patient's own perceptions) and "external" views (based on the observations of doctors or pathologists). Although the two views can certainly be combined (a good practitioner would be interested in both), major tension often exists between evaluations based respectively on the two perspectives. The external view has come under considerable criticism recently, particularly from anthropological perspectives, for taking a distanced and less sensitive view of illness and health. 1 2 It has also been argued that public health decisions are quite often inadequately responsive to the patient's own understanding of suffering and healing. This type of criticism sometimes has much cogency, but in assessing this debate the severe limitations of the internal perspective must also be considered. Self reported morbidity is, in fact, already widely used as a part of social statistics, and a scrutiny of these statistics brings out difficulties that can thoroughly mislead public policy on health care and medical strategy.
For sensory assessment, the priority of the internal view can hardly be
disputed Consider the different states of India, which have very diverse medical conditions, mortality rates, educational achievements, and so on. The state of Kerala has the highest levels of literacy (nearly universal for the young) and longevity (a life expectancy of about 74 years) in India. But it also has, by a very wide margin, the highest rate of reported morbidity among all Indian states (this applies to age specific as well as total comparisons). At the other extreme, states with low longevity, with woeful medical and educational facilities, such as Bihar, have the lowest rates of reported morbidity in India. Indeed, the lowness of reported morbidity runs almost fully in the opposite direction to life expectancy, in interstate comparisons.3-5 We have to ask why such dissonance arises. There is much evidence that people in states that provide more education and better medical and health facilities are in a better position to diagnose and perceive their own particular illnesses than are the people in less advantaged states, where there is less awareness of treatable conditions (to be distinguished from "natural" states of being). The medically ill-served and substantially illiterate population of Bihar may have a very low perception of illness, but that is no indication that there is little illness to perceive. This interpretation is supported also by comparing the reported morbidity rates in the Indian states and in the United States. In disease by disease comparison, while Kerala has much higher reported morbidity rates than the rest of India, the United States has even higher rates for the same illnesses.6 If we insist on relying on self reported morbidity as the measure, we would have to conclude that the United States is the least healthy in this comparison, followed by Kerala, with ill provided Bihar enjoying the highest level of health, in this charmed internal comparison. Although the internal view is privileged with respect to some information
(particularly that of a sensory nature), it can be deeply deficient
in other ways. There is a strong need for scrutinising the statistics
on self perception of illness in a social context by taking note of
levels of education, availability of health facilities, and public
information on illness and remedy.3-5
The internal view of health deserves attention, but relying on it in
assessing health care or in evaluating medical strategy can be
extremely misleading. Master's Lodge, Trinity College, Cambridge CB2 1TQ
Rapid Responses:Read all Rapid Responses
Other related articles in BMJ:
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 "A foolish faith in authority is the worst enemy of truth." -- Albert Einstein, letter to a friend, 1901 "I know of no safe depository of the ultimate powers of the society but the people themselves, and if we think them not enlightened enough to exercise control with a wholesome discretion, the remedy is not to take it from them, but to inform their discretion by education." -- Thomas Jefferson, letter to William C. Jarvis, September 28, 1820 "What's the point of vaccination if it doesn't protect you from the unvaccinated?" -- Sandy Gottstein "Who gets to decide what the greater good is and how many will be sacrificed to it?" -- Sandy Gottstein |
for example,
pain is quintessentially a matter of self perception. If you feel
pain, you do have pain, and if you do not feel pain, then no external
observer can sensibly reject the view that you do not have pain. But
medical practice is not concerned only with the sensory dimension of
ill health. One problem with relying on the patient's own view of
matters that are not entirely sensory lies in the fact that the
patient's internal assessment may be seriously limited by his or her
social experience. To take an extreme case, a person brought up in a
community with a great many diseases and few medical facilities may
be inclined to take certain symptoms as "normal" when they are
clinically preventable. 