Table 1.

Likelihood Ratios and Bedside Estimates

Likelihood Ratio	Approximate Change in Probability (%)*
Values between 0 and 1 decrease the probability of disease
0.1	−45
0.2	−30
0.3	−25
0.4	−20
0.5	−15
1	0
Values greater than 1 increase the probability of disease
2	+15
3	+20
4	+25
5	+30
6	+35
7
8	+40
9
10	+45

The text describes how to easily recall these estimates.