Template:DiagnosticTesting Example: Difference between revisions
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|style="background:#ccffcc;"|<span style="color:#006600;">'''True positive'''</span><br />(TP) = 20 |
|style="background:#ccffcc;"|<span style="color:#006600;">'''True positive'''</span><br />(TP) = 20 |
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|style="background:#eedddd;"|<span style="color:#cc0000;">'''False positive'''</span><br />(FP) = 180 |
|style="background:#eedddd;"|<span style="color:#cc0000;">'''False positive'''</span><br />(FP) = 180 |
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|style="background:#ccffff;"|[[Positive predictive value]]<div style="text-align:left; margin-left:1em;">= TP / (TP + FP)<br />= 20 / (20 + 180)<br />= '''10%'''</div> |
|style="background:#ccffff;"|[[Positive predictive value]] (PPV)<div style="text-align:left; margin-left:1em;">= TP / (TP + FP)<br />= 20 / (20 + 180)<br />= '''10%'''</div> |
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|style="background:#aadddd;"|Test<br />outcome<br />negative |
|style="background:#aadddd;"|Test<br />outcome<br />negative |
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|style="background:#eedddd;"|<span style="color:#cc0000;">'''False negative'''</span><br />(FN) = 10 |
|style="background:#eedddd;"|<span style="color:#cc0000;">'''False negative'''</span><br />(FN) = 10 |
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|style="background:#bbeebb;"|<span style="color:#006600;">'''True negative'''</span><br />(TN) = 1820 |
|style="background:#bbeebb;"|<span style="color:#006600;">'''True negative'''</span><br />(TN) = 1820 |
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|style="background:#aadddd;"|[[Negative predictive value]]<div style="text-align:left; margin-left:1em;">= TN / (FN + TN)<br />= 1820 / (10 + 1820)<br />≈ '''99.5%'''</div> |
|style="background:#aadddd;"|[[Negative predictive value]] (NPV)<div style="text-align:left; margin-left:1em;">= TN / (FN + TN)<br />= 1820 / (10 + 1820)<br />≈ '''99.5%'''</div> |
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Revision as of 17:41, 26 November 2019
| Patients with bowel cancer (as confirmed on endoscopy) | ||||
| Condition positive | Condition negative | |||
| Fecal occult blood screen test outcome |
Test outcome positive |
True positive (TP) = 20 |
False positive (FP) = 180 |
Positive predictive value (PPV) = TP / (TP + FP)
= 20 / (20 + 180) = 10% |
| Test outcome negative |
False negative (FN) = 10 |
True negative (TN) = 1820 |
Negative predictive value (NPV) = TN / (FN + TN)
= 1820 / (10 + 1820) ≈ 99.5% | |
| Sensitivity = TP / (TP + FN)
= 20 / (20 + 10) ≈ 67% |
Specificity = TN / (FP + TN)
= 1820 / (180 + 1820) = 91% | |||