Table 1

Studies using PHQ-15 symptoms count*

Purpose of studyNumber of studiesStudy (listed by reference)Total number of patients studied
Screening45 7–92422
Diagnostic1810–2743 360
Quasi-diagnostic†76 28–3317 016
Severity1216 34–4417 037
  • *Based on systematic review of the MEDLINE database between 1 January 1999 and 31 January 2014 using the search terms ‘PRIME MD’, ‘Patient Health Questionnaire’ and ‘PHQ-15’.

  • †Quasi-diagnostic refers to use of PHQ 15 to denote a group of patients for study as patients who have ‘high symptom counts’.

  • PHQ, Patient Health Questionnaire.