Studies using PHQ-15 symptoms count*
| Purpose of study | Number of studies | Study (listed by reference) | Total number of patients studied |
|---|---|---|---|
| Screening | 4 | 5 7–9 | 2422 |
| Diagnostic | 18 | 10–27 | 43 360 |
| Quasi-diagnostic† | 7 | 6 28–33 | 17 016 |
| Severity | 12 | 16 34–44 | 17 037 |
*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.