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Dictionary of Evidence-based Medicine.pdf

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R<br />

Randomized clinical trial (see under Clinical trial)<br />

Randomized consent design (see under Post-randomization consent<br />

design)<br />

RCT (see under Clinical trial)<br />

Reactance theory<br />

Reactance theory was put forward to explain why people <strong>of</strong>ten do the<br />

opposite to what they have been asked to do. The theory suggests that<br />

people believe they have a set <strong>of</strong> free behaviours in which they can engage.<br />

Any threat to these generates a reaction aimed at preserving the threatened<br />

free behaviours. The individual demonstrates an intensity <strong>of</strong> reactance,<br />

which is in proportion to the magnitude <strong>of</strong> the perceived threat, the number<br />

<strong>of</strong> free behaviours being threatened and the value placed on the intensity<br />

<strong>of</strong> the reactance on them. Reactance theory has been used to explain<br />

non-compliance to prescribed treatment regimens (Fogarty JS (1997)<br />

Reactance theory and patient noncompliance. Social Science and <strong>Medicine</strong>.<br />

45: 1277-88. Brehm JW (1966) A theory <strong>of</strong> psychological reactance. Academic<br />

Press, New York).<br />

Read codes<br />

The Read codes are a clinical classification system being developed by the<br />

UK Department <strong>of</strong> Health for computerizing medical records and, in<br />

particular, general practice data. The intention is to produce comprehensive<br />

information about individual patients so that clinical decisions can<br />

be better informed. The data should also allow better audit <strong>of</strong> health needs<br />

and hence better targeting <strong>of</strong> health care resources (DoH (1990) New classification<br />

will streamline computerized medical records. DoH, London. Smith N,<br />

Wilson A, Weekes T (1995) Use <strong>of</strong> Read codes in development <strong>of</strong> a standard

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