Sensitivity specificity and predictive values

Sensitivity and specificity, which are integral to validity, are important considerations in decision making in medicine, particularly in choosing appropriate investigations for disease diagnoses. The method of calculation of sensitivity and specificity, and predictive values is summarised in Figure 13.1 . The sensitivity of a test depends on the proportion of people with the characteristic (disease) in whom the test is positive (that is, percentage positive with disease). The ultimate sensitive test is one that detects all true positive cases.

The specificity of a test depends on the proportion of people without the characteristic (disease) in whom the test is negative (that is, percentage negative of healthy people). The ultimate specific test is one that detects all the truly negative (disease-free) cases. A clinical example of sensitivity and specificity is presented in Table 13.1 .

Dealing With Back Pain

Dealing With Back Pain

Deal With Your Pain, Lead A Wonderful Life An Live Like A 'Normal' Person. Before I really start telling you anything about me or finding out anything about you, I want you to know that I sympathize with you. Not only is it one of the most painful experiences to have backpain. Not only is it the number one excuse for employees not coming into work. But perhaps just as significantly, it is something that I suffered from for years.

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