Depression is estimated to become a worldwide widespread disorder, with an immense burden to the populace. Among the obtainable self-assessment instruments, are The Patient Health Questionnaire-9 Item (PHQ-9) and Beck Depression Inventory–II (BDI-II) that are often utilized to measure depression severity (Lloyd, 2013). Reliable and accurate measurement of depression is vital for successful diagnosis, treatment planning, and assessment of treatment. Psychometric assessments of the PHQ-9 and BDI-II show that each measure has sound psychometric properties and is appropriate for clinical examinations and monitoring of treatment improvements.

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The BDI-II seems to rate more patients as severe, and though both measures are reactive to change, criteria for clinically noteworthy variation was met more on the PHQ-9 compared to the BDI-II (Lloyd, 2013). Pending the outcomes of further researches, the aspects of the PHQ-9, of being shorter, freely accessible, and founded on the diagnostic principles for depression, may show an advantage over the BDI-II.

Andréasson, P. D., & Williams, J. (2012). Validation of the self-compassion scale: Correlations with the Beck Depression Inventory-II : a thesis. San Luis Obispo, CA: California Polytechnic State University.
Botha, M. N., & North-West University (South Africa). (2011). Validation of the Patient Health Questionnaire (PHQ-9) in an African context.

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