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Table 3 Effects of different base rates on MDD classification accuracy

From: Sequential screening for depression in humanitarian emergencies: a validation study of the Patient Health Questionnaire among Syrian refugees

Screening methodRepresentative prevalencea (%)PPV (%)NPV (%)
PHQ-25999
354989
818852
PHQ-2/8 sequential screening510099
3510094
8110068
  1. PHQ-2 2-item Patient Health Questionnaire, PPV positive-predictive value, NPV negative-predictive value
  2. aBaseline prevalence representative of (a) 5%, the level of depression worldwide [38]; (b) 35%, the prevalence reported in a metanalysis of depression among refugees [39], and (c) 81%, the highest reported depression prevalence among refugees [40]