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Figure 1 Model-based survival curves for survival by hormone replacement therapy (HRT) use in postmenopausal women. Difference between HRT subgroups is significant. (Wald chi-square p value for HRT = 0.04) Adjustment was made for etiology of disease (coronary artery disease vs. non-coronary artery disease), cardiothoracic ratio, New York Heart Association functional classification, left ventricular ejection fraction, and treatment group. CI = confidence interval; HR = hazard ratio.