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Independent predictors of low (0.5 – 0.9 ng/ml) serum digoxin concentrations among patients < 65 years (left panel: n=806; median age, 58 years) and ≥ 65 years (right panel: n=881; median age, 72 years) [Chronic kidney disease=estimated glomerular filtration rate <60 ml/m/1.73 square meters; OR=odds ratio, CI=confidence interval
