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Figure 3 Plot of adjusted survival curves in placebo and various digoxin serum concentration groups. Results from this categorical analysis demonstrated that women with serum concentrations from 0.5 to 0.9 ng/ml had similar survival compared with those receiving placebo (hazard ratio 0.81, with 95% confidence interval from 0.58 to 1.14, p = 0.229), whereas women with serum concentrations from 1.2 to 2.0 ng/ml seemed to have a worse outcome (hazard ratio 1.11, with 95% confidence interval from 0.78 to 1.60, p = 0.557). SDC = serum digoxin concentration.
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