Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional study
Objective To evaluate the clinical reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis.Design Cross-sectional study.Setting Tertiary care centre.Participants Patients with psoriasis who have not been diagnosed with depression (n=...
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| Format: | Article |
| Language: | English |
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BMJ Publishing Group
2020-07-01
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| Series: | BMJ Open |
| Online Access: | https://bmjopen.bmj.com/content/10/7/e033211.full |
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| author | Changqiang Li Xue-Li Zhang Xin Ye Hui-Ling Shu Xia Feng Deng-mei Xia Zheng-qun Wang Wen-yao Mi Bei Yu |
| author_facet | Changqiang Li Xue-Li Zhang Xin Ye Hui-Ling Shu Xia Feng Deng-mei Xia Zheng-qun Wang Wen-yao Mi Bei Yu |
| author_sort | Changqiang Li |
| collection | DOAJ |
| description | Objective To evaluate the clinical reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis.Design Cross-sectional study.Setting Tertiary care centre.Participants Patients with psoriasis who have not been diagnosed with depression (n=148; mean age 43.37±17.46 years; 31.19% female).Primary and secondary outcome measures The primary outcome measures considered in this study were the C-PHQ-9 and the Hamilton Depression Scale (HAMD). The American Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-V) was used as the gold standard for the diagnosis of depression. Cronbach’s α and test–retest reliability after 1 week were evaluated using reliability analysis, and criterion and structural validity were assessed using validity analysis. Receiver operating characteristic (ROC) analysis was performed to identify the best demarcation score and diagnostic accuracy.Results Compared with DSM-V (27.27%), both C-PHQ-9 (39.19%) and HAMD (31.01%) had higher rates for detecting depression. The mean completion time for C-PHQ-9 evaluation (2.02±0.84 min) was significantly less than that for HAMD (23.37±3.21 min, p<0.001). The Cronbach’s α coefficient for the C-PHQ-9 was 0.938. The correlation coefficients of the nine items with the total scale ranged from 0.540 to 0.854, and the mean inter-item correlation coefficients ranged from 0.376 to 0.933. After a week, the retest coefficient was 0.955 (p<0.01). Principal component factor analysis showed that C-PHQ-9 identified a unifactorial structure. The best cut-off point was 9 points, with a sensitivity of 98.00% and a specificity of 90.80%. The area under the ROC curve was 0.979 (95% CI 0.968 to 0.991).Conclusion C-PHQ-9 has good reliability and validity in patients with psoriasis and can be used for primary screening of patients with psoriasis and depression. This scale has obvious time and labour advantages over the HAMD and should be considered for use in clinical practice. |
| format | Article |
| id | doaj-art-e583ab669c13451b9daefdc37466e092 |
| institution | OA Journals |
| issn | 2044-6055 |
| language | English |
| publishDate | 2020-07-01 |
| publisher | BMJ Publishing Group |
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| series | BMJ Open |
| spelling | doaj-art-e583ab669c13451b9daefdc37466e0922025-08-20T02:18:43ZengBMJ Publishing GroupBMJ Open2044-60552020-07-0110710.1136/bmjopen-2019-033211Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional studyChangqiang Li0Xue-Li Zhang1Xin Ye2Hui-Ling Shu3Xia Feng4Deng-mei Xia5Zheng-qun Wang6Wen-yao Mi7Bei Yu8Department of Dermatology, Affiliated Hospital of Southwest Medical University, Luzhou, China1 State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, ChinaInstitute for Global Public Policy, Fudan University, Shanghai, ChinaDepartment of Dermatology, Affiliated Hospital of Southwest Medical University, Luzhou, China1 Centre for Health Management and Policy Research, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, ChinaDepartment of Dermatology, Affiliated Hospital of Southwest Medical University, Luzhou, ChinaDepartment of Dermatology, Affiliated Hospital of Southwest Medical University, Luzhou, ChinaDepartment of Dermatology, Affiliated Hospital of Southwest Medical University, Luzhou, ChinaDepartment of Dermatology, Affiliated Hospital of Southwest Medical University, Luzhou, ChinaObjective To evaluate the clinical reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis.Design Cross-sectional study.Setting Tertiary care centre.Participants Patients with psoriasis who have not been diagnosed with depression (n=148; mean age 43.37±17.46 years; 31.19% female).Primary and secondary outcome measures The primary outcome measures considered in this study were the C-PHQ-9 and the Hamilton Depression Scale (HAMD). The American Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-V) was used as the gold standard for the diagnosis of depression. Cronbach’s α and test–retest reliability after 1 week were evaluated using reliability analysis, and criterion and structural validity were assessed using validity analysis. Receiver operating characteristic (ROC) analysis was performed to identify the best demarcation score and diagnostic accuracy.Results Compared with DSM-V (27.27%), both C-PHQ-9 (39.19%) and HAMD (31.01%) had higher rates for detecting depression. The mean completion time for C-PHQ-9 evaluation (2.02±0.84 min) was significantly less than that for HAMD (23.37±3.21 min, p<0.001). The Cronbach’s α coefficient for the C-PHQ-9 was 0.938. The correlation coefficients of the nine items with the total scale ranged from 0.540 to 0.854, and the mean inter-item correlation coefficients ranged from 0.376 to 0.933. After a week, the retest coefficient was 0.955 (p<0.01). Principal component factor analysis showed that C-PHQ-9 identified a unifactorial structure. The best cut-off point was 9 points, with a sensitivity of 98.00% and a specificity of 90.80%. The area under the ROC curve was 0.979 (95% CI 0.968 to 0.991).Conclusion C-PHQ-9 has good reliability and validity in patients with psoriasis and can be used for primary screening of patients with psoriasis and depression. This scale has obvious time and labour advantages over the HAMD and should be considered for use in clinical practice.https://bmjopen.bmj.com/content/10/7/e033211.full |
| spellingShingle | Changqiang Li Xue-Li Zhang Xin Ye Hui-Ling Shu Xia Feng Deng-mei Xia Zheng-qun Wang Wen-yao Mi Bei Yu Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional study BMJ Open |
| title | Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional study |
| title_full | Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional study |
| title_fullStr | Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional study |
| title_full_unstemmed | Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional study |
| title_short | Reliability and validity of the Chinese version of the Patient Health Questionnaire-9 (C-PHQ-9) in patients with psoriasis: a cross-sectional study |
| title_sort | reliability and validity of the chinese version of the patient health questionnaire 9 c phq 9 in patients with psoriasis a cross sectional study |
| url | https://bmjopen.bmj.com/content/10/7/e033211.full |
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