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But these statistics cannot be used if there is more than one independentvariable. To perform multivariable analysis with dichotomous outcomesusemultiple(binary)logisticregression.9To appreciate the value of logistic regression for analyzing dichotomousvariables, look at Figure 3.4. It shows the association between skeletal musclestrength (measured in the deltoid muscle) and presence of cardiomyopathyamong alcoholics. You can see that at low levels of muscle strength (left-handside of the curve), there are several closed circles (representing patients withcardiomyopathy) while there are no open circles (patients with normal cardiacfunction).Incontrast,athighlevelsofmusclestrength(right-handside10of the curve) there are many open circles and few closed circles, reflecting that patients without cardiomyopathy have normal muscle strength. The trianglesindicatetheprobabilityofcardiomyopathyatdifferentlevelsofmusclestrength.Thecurveconnectingthetrianglesshowsthatatintermediatelevelsofmuscle strength, there is a rapidly decreasing proportion of patients withcardiomyopathy as muscle strength increases.
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