Arvin Bhana1, Sujit D Rathod2, One Selohilwe3, Tasneem Kathree4, Inge Petersen5. 1. School of Applied Human Sciences, University of KwaZulu-Natal, Durban, South Africa. arvin.bhana@gmail.com. 2. Department of Population Health, London School of Hygiene and Tropical Medicine, London, UK. Sujit.Rathod@lshtm.ac.uk. 3. School of Applied Human Sciences, University of KwaZulu-Natal, Durban, South Africa. Selohilwe@ukzn.ac.za. 4. School of Applied Human Sciences, University of KwaZulu-Natal, Durban, South Africa. Kathree@ukzn.ac.za. 5. School of Applied Human Sciences, University of KwaZulu-Natal, Durban, South Africa. PETERSENI@ukzn.ac.za.
Abstract
BACKGROUND: People with chronic health conditions are known to have a higher prevalence of depressive disorder. The Patient Health Questionnaire (PHQ-9) is a widely-used screening tool for depression which has not yet been validated for use on chronic care patients in South Africa. METHODS: A sample of 676 chronic care patients attending two primary health facilities in North West Province, South Africa were administered the PHQ-9 by field workers and a diagnostic interview (the Structured Clinical Interview for DSM-IV) (SCID) by clinical psychologists. The PHQ-9 and the PHQ-2 were evaluated against the SCID, as well as for sub-samples of patients who were being treated for HIV infection and for hypertension. RESULTS: Using the SCID, 11.4 % of patients had major depressive disorder. The internal consistency estimate for the PHQ-9 was 0.76, with an area under the receiver operator curve (AUROC) of 0.85 (95 % CI 0.82-0.88), which was higher than the AURUC for the PHQ-2 (0.76, 95 % CI 0.73-0.79). Using a cut-point of 9, the PHQ-9 has sensitivity of 51 % and specificity of 94 %. The PHQ-9 AUROC for the sub-samples of patients with HIV and with hypertension were comparable (0.85 and 0.86, respectively). CONCLUSIONS: The PHQ-9 is useful as a screening tool for depression among patients receiving treatment for chronic care in a public health facility.
BACKGROUND:People with chronic health conditions are known to have a higher prevalence of depressive disorder. The Patient Health Questionnaire (PHQ-9) is a widely-used screening tool for depression which has not yet been validated for use on chronic care patients in South Africa. METHODS: A sample of 676 chronic care patients attending two primary health facilities in North West Province, South Africa were administered the PHQ-9 by field workers and a diagnostic interview (the Structured Clinical Interview for DSM-IV) (SCID) by clinical psychologists. The PHQ-9 and the PHQ-2 were evaluated against the SCID, as well as for sub-samples of patients who were being treated for HIV infection and for hypertension. RESULTS: Using the SCID, 11.4 % of patients had major depressive disorder. The internal consistency estimate for the PHQ-9 was 0.76, with an area under the receiver operator curve (AUROC) of 0.85 (95 % CI 0.82-0.88), which was higher than the AURUC for the PHQ-2 (0.76, 95 % CI 0.73-0.79). Using a cut-point of 9, the PHQ-9 has sensitivity of 51 % and specificity of 94 %. The PHQ-9 AUROC for the sub-samples of patients with HIV and with hypertension were comparable (0.85 and 0.86, respectively). CONCLUSIONS: The PHQ-9 is useful as a screening tool for depression among patients receiving treatment for chronic care in a public health facility.
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