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Decision tree predicting vitamin D status in patients with heart failure. Variable name and p-value is shown inside the circle; the corresponding lines show cut-off values. Bar graphs at the bottom show 25(OH)D status distribution amongst patients. Apo = apolipoprotein; sufficiency = 25(OH)D ≥ 30 ng/mL, insufficiency = 25(OH)D ≥ 20 and < 30 ng/mL, and deficiency = 25(OH)D < 20 ng/mL [30]. 25(OH)D = 25-hydroxyvitamin D.
