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Figure 2 Model-based survival curves by hormone replacement therapy (HRT) use within etiology of disease. Differences are significant for women with a non-coronary artery disease (CAD) etiology but not for those with a CAD etiology. Adjustment was made for cardiothoracic ratio, New York Heart Association functional classification, left ventricular ejection fraction, and treatment group. CI = confidence interval; HR = hazard ratio.