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Median ejection fraction of normal and affected treated Dachshunds between 12 and 17 months of age. Over this age range, the mean ejection fraction of the affected dogs was lower than that of the normal dogs at every age assessed. Comparison of the data using the Mann–Whitney rank-sum test indicated that the ejection volume in the affected treated dogs was significantly lower than in the normal dogs over this age range (P<0.01).
