Ver el código de «Likelihood ratios»

==Likelihood Ratio Approximate Change in Probability (%)==

{| {{table}}
| align="center" style="background:#f0f0f0;"|'''LR'''
| align="center" style="background:#f0f0f0;"|'''Post-Test Probablility Change'''
|-
| 9-10||45%
|-
| 7-8||40%
|-
| 6||35%
|-
| 5||30%
|-
| 4||25%
|-
| 3||20%
|-
| 2||15%
|-
| '''1'''||'''0%'''
|-
| 0.5||-15%
|-
| 0.4||-20%
|-
| 0.3||-25%
|-
| 0.2||-30%
|-
| 0.1||-45%
|}
*Values <1 decrease the probability of disease 
*Values >1 increase the probability of disease 

==Comments<ref>J Gen Intern Med. 2002 August; 17(8): 647–650.</ref>==
An easy way to recall at the bedside by simply remembering 3 specific LRs 2, 5, and 10—and the first 3 multiples of 15 (i.e., 15, 30, and 45). An LR of 2 increases probability 15%, one of 5 increases it 30%, and one of 10 increases it 45%. For those LRs between 0 and 1, the clinician simply inverts 2, 5, and 10 (i.e., 1/2 = 0.5, 1/5 = 0.2, 1/10 = 0.1). Just as the LR of 2.0 increases probability 15%, its inverse, 0.5, decreases probability 15%. Similarly, an LR of 0.2 (the inverse of 5) decreases probability 30%, and a LR of 0.1 (the inverse of 10) decreases it 45%. These benchmark LRs can be used to approximate the remainder of Table 1.

Although this method is inaccurate for pretest probabilities less than 10% or greater than 90%, this is not a disadvantage, because these polar extremes of probability indicate diagnostic certainty for most clinical problems, making it unnecessary to order further tests (and apply additional LRs).

==References==
<references/>

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