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Validation of PHQ-2 and PHQ-9 to Screen for Major Depression in the Primary Care Population
Open accessAbstract
PURPOSE: Although screening for unipolar depression is controversial, it is potentially an efficient way to find undetected cases and improve diagnostic acumen. Using a reference standard, we aimed to validate the 2- and 9-question Patient Health Questionnaires (PHQ-2 and PHQ-9) in primary care settings. The PHQ-2 comprises the first 2 questions of the PHQ-9. METHODS: Consecutive adult patients attending Auckland family practices completed the PHQ-9, after which they completed the Composite International Diagnostic Interview (CIDI) depression reference standard. Sensitivities and specificities for PHQ-2 and PHQ-9 were analyzed. RESULTS: There were 2,642 patients who completed both the PHQ-9 and the CIDI. Sensitivity and specificity of the PHQ-2 for diagnosing major depression were 86% and 78%, respectively, with a score of 2 or higher and 61% and 92% with a score 3 or higher; for the PHQ-9, they were 74% and 91%, respectively, with a score of 10 or higher. For the PHQ-2 a score of 2 or higher detected more cases of depression than a score of 3 or higher. For the PHQ-9 a score of 10 or higher detected more cases of major depression than the PHQ determination of major depression originally described by Spitzer et al in 1999. CONCLUSIONS: We report the largest validation study of the PHQ-2 and PHQ-9, compared with a reference standard interview, undertaken in an exclusively primary care population. The PHQ-2 score or 2 or higher had good sensitivity but poor specificity in detecting major depression. Using a PHQ-2 threshold score of 2 or higher rather than 3 or higher resulted in more depressed patients being correctly identified. A PHQ-9 score of 10 or higher appears to detect more depressed patients than the originally described PHQ-9 scoring for major depression.
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“The PHQ-2 score was used to estimate the severity of depression, which assessed the frequency of depressed mood and anhedonia over the past two weeks [22].”
From Association between first-line antidepressant use and risk of dementia in older adults: a retrospective cohort study (2023) · cites this paper as [22]
Experimental — accuracy not yet measuredThe check wasn’t confident either way, so it gives no verdict — never disputed.
In the citing paper
“The PHQ-8 has excellent internal consistency (Cronbach α=.89) and excellent test-retest reliability [47].”
From Feasibility and Preliminary Efficacy of Digital Interventions for Depressive Symptoms in Working Adults: Multiarm Randomized Controlled Trial (2023) · cites this paper as [47]
Experimental — accuracy not yet measuredThe check wasn’t confident either way, so it gives no verdict — never disputed.
In the citing paper
“The PHQ-8 has excellent internal consistency (Cronbach α of .89 in primary care settings and .88 in this study at t0) and excellent test–retest reliability [49].”
From Feasibility and Preliminary Efficacy of Web-Based and Mobile Interventions for Common Mental Health Problems in Working Adults: Multi-Arm Randomized Pilot Trial (2022) · cites this paper as [49]
Experimental — accuracy not yet measured
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“Psychometric studies recommend a cut-off of 10, which has demonstrated a sensitivity ranging from 74% to 88% and a specificity of 84% to 91% when examining major depression disorders [25,27].”
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“Fourth, both depression and anxiety were assessed by two-item scales, which although widely validated by previous studies [53,54,78,79], may not represent the complex symptoms and constrained us from analyzing them as latent constructs.”
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“, physician-diagnosed depression ever in life/depression in the last 12 months, and anxiety disorders ever diagnosed in life; • The presence of (undiagnosed) current depressive symptoms using the 2-item Patient Health Questionnaire (PHQ-2) [44].”
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Alsughier, N. A. (2024) · The International Journal of Psychiatry in Medicine · doi:10.1177/00912174241287332 · Cited by 1
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“The Patient Health Questionnaire 2/9 [28] is a version that only requires completion of all nine items if the first two are endorsed.”
Chapter 1. The Reproductive Life Cycle
Lighten, A., Zein, M., Olgun, M., & Catapano, L. A. (2021) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615379545.lg01 · Cited by 1
Zan, Y., Guo, C., Yin, Y., & Dong, G. (2025) · Frontiers in Psychiatry · doi:10.3389/fpsyt.2025.1523060 · Cited by 1
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Searchfield, G. D., & Vajsakovic, D. (2025) · Hearing Research · doi:10.1016/j.heares.2025.109413 · Cited by 1
An eDelphi Consensus on Key Questions for a Vulvar Health Clinic Intake Questionnaire
Foster, J., Negris, O., Abraham, O., Kraus, C. N., Little, A. J., Patel, A., Vaughn, O. L. A., & Mauskar, M. (2025) · Journal of Lower Genital Tract Disease · doi:10.1097/lgt.0000000000000919 · Cited by 1
Suicide Risk and Protective Factors for Sexual Minority College Students: A Latent Class Analysis
Cook, K. (2025) · OMEGA - Journal of Death and Dying · doi:10.1177/00302228251390153 · Cited by 1
Ammann, P., Jeong, A. L., Lovison, G., Doetzer, J., Fuhrimann, S., Imboden, M., Ingold, K. M., Winkler, M. S., & Probst-Hensch, N. M. (2025) · BMC Public Health · doi:10.1186/s12889-025-25407-z · Cited by 1
“Both tools are validated in primary care settings [46, 47].”
Depression, Populism, and Presidential Approval
Baum, M., Druckman, J. N., Ognyanova, K., Lazer, D., & Perlis, R. H. (2025) · International Journal of Public Opinion Research · doi:10.1093/ijpor/edaf050 · Cited by 1
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Khan, S., Fennell, M. L., Fallah, M., Jordan, H., Kroezen, Z., Britz‐McKibbin, P., Millar, P. J., Heister, R., Vohl, M., & Keathley, J. (2026) · Orphanet Journal of Rare Diseases · doi:10.1186/s13023-025-04131-2 · Cited by 1
“The mental health assessments will consist of the Patient Health Questionnaire (PHQ-9) [23], the General Anxiety Disorder (GAD-7) survey [24], and the Barratt Impulsiveness Scale (BIS-11) [25].”
Bai, W., Zheng, Y., Lin, S., Pan, Y., Zhan, Y. J., & Liu, M. (2026) · Journal of Public Health · doi:10.1093/pubmed/fdag004 · Cited by 1
Sloan, K., Orionzi, D. E., & Muench, U. (2026) · Psycho-Oncology · doi:10.1002/pon.70451 · Cited by 1
“The PHQ‐2 variable had scores between 0 and 6, which we analyzed as a binary variable with scores of 0–1 for no depression symptoms and scores of 2–6 indicating depression symptoms, based on prior literature [23, 24].”
Kringle, E. A., Jahnke, K., Badu, A., Walsh, J., Skidmore, E. R., Lakshminarayan, K., Gibbs, B. B., & Lewis, B. (2026) · Telemedicine Reports · doi:10.1177/26924366261447903 · Cited by 1
Emery, J. D., Saya, S., Chondros, P., Chatterton, M. L., Mihalopoulos, C., Galea, M., Chen, T., Polasek, T. M., Laughlin, A., Hesson, L. B., et al. (2026) · The Lancet Primary Care · doi:10.1016/j.lanprc.2026.100158 · Cited by 1
Self-citationGutsche, A., Buttgereit, T., Buchkremer, R., Panse, J., Kreddig, N., Ptock, O., Roll, S., Grabowska, W. A., Aulenbacher, F., Metz, M., et al. (2026) · Clinical and Translational Allergy · doi:10.1002/clt2.70184 · Cited by 1
Chow, C.-Y., Wong, V. W.-H., & Ho, F. Y. (2026) · Journal of Affective Disorders · doi:10.1016/j.jad.2026.122319 · Cited by 1
Trinh, N., Hails, K. A., Flaherty, K., Chang, T. E., D, M. F. M., & Yeung, A. (2015) · Journal of Health Care for the Poor and Underserved · doi:10.1353/hpu.2015.0096 · Cited by 1
Prescriptive Guide for Getting the Depressed Employee Back to Work
Timm, B. J., Swanton, C. L., Asp, K. M., Miller, S. K., & Ring, D. L. (2013) · The Journal for Nurse Practitioners · doi:10.1016/j.nurpra.2013.02.020 · Cited by 1
Care for common mental health problems: applying evidence beyond RCTs
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Assessing Depression in the Primary Care Setting
Haefner, J., Daly, M., & Russell, S. (2017) · Journal of Doctoral Nursing Practice · doi:10.1891/2380-9418.10.1.28 · Cited by 1
“Asking these first two questions of the PHQ-9 is found to be 86% sensitive and 78% specific in adults for a score of 2 or higher (Arroll et al., 2010).”
BackgroundAssociation between Spirometric Parameters and Depressive Symptoms in New Mexico Uranium Workers
Sharma, S., Shore, X., Mohite, S., Myers, O., Kesler, D. O., Vlahovich, K., & Sood, A. (2021) · Southwest Journal of Pulmonary and Critical Care · doi:10.13175/swjpcc015-20 · Cited by 1
“The questionnaire included demographics, severity of dyspnea via the modified Medical Research Council (mMRC) Dyspnea Scale (13), information on smoking history, cardiovascular status, and screening for depressive symptoms (using the modified Patient Health Questionnaire or PHQ-2) which includes two items on depressed…”
MethodEndrighi, R., Zhao, Y., Hughes, R. B., Kumar, D., & Borrelli, B. (2021) · Annals of Behavioral Medicine · doi:10.1093/abm/kaab077 · Cited by 1
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Supportive and Palliative Care for Genitourinary Malignancies
Wulff-Burchfield, E. M. (2022) · Springer eBooks · doi:10.1007/978-3-030-89891-5_2 · Cited by 1
Association between daily working hours and depressive symptoms in resident physicians in Peru
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“The PHQ-9 is a 9-item self-report questionnaire assessing experiences of depression (Arroll et al., 2010).”
BackgroundMethodBienestar subjetivo e indicadores de depresión en estudiantes universitarios
Orantes, K. J., Ordóñez, V. R. U., & González-Aguilar, D. W. (2022) · Revista Guatemalteca de Educación Superior · doi:10.46954/revistages.v5i2.92 · Cited by 1
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Self-citation
Metadata
- Authors
- Arroll, B., Goodyear-Smith, F., Crengle, S., Gunn, J., Kerse, N., Fishman, T., Falloon, K., & Hatcher, S.
- Affiliations
- University of Auckland (NZ)
- Venue
- The Annals of Family Medicine
- Publisher
- Annals of Family Medicine
- Published
- 2010-07-01
- Volume
- 8
- Issue
- 4
- Pages
- 348-353
- ISSN
- 1544-1709 (ISSN-L)
- 1544-1717
- PMC
- PMC2906530
- OpenAlex
- W2122884679
- Cited by
- 1,279
- References
- 18
- Citations by year
- 2026: 60 · 2025: 89 · 2024: 115 · 2023: 115 · 2022: 137 · 2021: 182 · 2020: 116 · 2019: 92 · 2018: 71 · 2017: 63 · 2016: 60 · 2015: 55 · 2014: 39 · 2013: 42 · 2012: 23
- FWCI
- 34.75
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Locations
- The Annals of Family Medicine (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- ResearchSpace (University of Auckland) (submittedVersion, cc-by)
- Funders
- Health Research Council of New Zealand
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
- Health Sciences › Medicine › Psychiatry and Mental health › Mental Health Treatment and Access
- Health Sciences › Medicine › Pharmacology (medical) › Treatment of Major Depression
- Keywords
- PHQ-2, PHQ-9, Patient Health Questionnaire, major depressive disorder, depression screening, primary care, screening sensitivity and specificity, Composite International Diagnostic Interview, threshold scores, general practice
- MeSH terms
- Adolescent, Adult, Aged, Aged, 80 and over, Major Depressive Disorder, Depressive Disorder, Major, Diagnosis, Computer-Assisted, Female, Humans, Male, Mass Screening, Middle Aged, New Zealand, Physicians, Family, Predictive Value of Tests, Primary Health Care, Psychometrics, Surveys and Questionnaires, Sensitivity and Specificity, Software, Time Factors, Prevalence, Young Adult
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