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| style="background: #ddffdd;" |'''''Negative'''''
|-
| rowspan="2" style="background: #ffdddd;"| '''Fecal<br>occult<br>blood<br>screen<br>test<br>outcome'''
| style="background: #ffdddd;"|'''''Positive'''''
| style="background: #eeeeff;"| <span style="color:#007700;"> '''TP = 2'''
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The [[prevalence]] in the population sample is calculated to be:
*Prevalence = (2 + 1) / 203 = 0.0148 or 1.48%
The individual's pre-test probability was more than twice the one of the population sample, although the individual's post-test probability was less than twice the one of the population sample (which is estimated by the positive predictive value of the test of 10%), opposite to what would result by a less accurate method of simply multiplying relative risks.sexo
====Specific sources of inaccuracy====
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