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ROC curve of the PHQ-9 for detecting a likely: a) ‘major depressive disorder’ in adults with Type 2 diabetes (N = 216); b) ‘major depressive disorder’ in the non-diabetic group (N = 99); c) ‘MDD and/or dysthymia’ in the diabetic group (N = 216); d) ‘MDD and/or dysthymia’ in the non-diabetic group (N = 99).
