Crohn's Disease: Likelihood Ratios

Introduction: None written.

The likelihood ratios of findings for Crohn's Disease are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %.	Post-Test Probability (Predictive Value): %.	Switch to display mode.
Note that calculating probabilities from more than one** finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)

Good Positive Likelihood Ratio
Finding	Result	+LR	-LR
[ + ] Clubbing	+ 0 -	2.8	0.5
for active disease, in patients with disease already diagnosed. Study: JAMA. 2001;286:341-347. http://jama.ama-assn.org/cgi/content/full/286/3/341