Validity and reliability of the Patient Health Questionnaire-8 in Swedish for individuals with systemic sclerosis
(2020) In Rheumatology International 40(10). p.1675-1687- Abstract
Background: Depressive symptoms are common in rheumatic diseases and influence patients’ quality of life. The Patient Health Questionnaire-9 (PHQ-9), which assesses symptoms of depression, is valid in English in patients with systemic sclerosis (SSc). However, the measurement properties of the PHQ-8 (short version of the PHQ-9) have not been evaluated in Swedish patients with SSc. Objective: To investigate different aspects of validity and reliability of the PHQ-8 in Swedish (PHQ-8 Swe) for individuals with SSc. Methods: A total of 101 patients with SSc participated. Content validity was evaluated via interviews of 11 patients and 10 health professionals. Construct validity, internal consistency test–retest reliability, and... (More)
Background: Depressive symptoms are common in rheumatic diseases and influence patients’ quality of life. The Patient Health Questionnaire-9 (PHQ-9), which assesses symptoms of depression, is valid in English in patients with systemic sclerosis (SSc). However, the measurement properties of the PHQ-8 (short version of the PHQ-9) have not been evaluated in Swedish patients with SSc. Objective: To investigate different aspects of validity and reliability of the PHQ-8 in Swedish (PHQ-8 Swe) for individuals with SSc. Methods: A total of 101 patients with SSc participated. Content validity was evaluated via interviews of 11 patients and 10 health professionals. Construct validity, internal consistency test–retest reliability, and floor/ceiling effects were evaluated in 90 patients. Results: Content validity was satisfactory, but some linguistic adjustments were made. Confirmatory factor analysis supported a better fit for a two-factor structure. Moderate-to-strong correlations were found between the PHQ-8 Swe and scleroderma HAQ including VAS (rs = 0.4–0.7); Multidimensional Assessment of Fatigue (rs = 0.7); RAND-36 subscales (rs = − 0.5 to − 0.8); and lung disease severity (Medsger scores) (rs = 0.4). There were weak correlations (rs = <0.4) between the PHQ-8 Swe and modified Rodnan skin score; and vascular, heart, and kidney disease severity. Cronbach’s alpha was 0.85, corrected item-to-total correlations were >0.40, and the ICC for the total score was 0.83. No floor/ceiling effects were found. Conclusion: The PHQ-8 Swe has satisfactory content validity and sufficient reliability in patients with in majority limited SSc. It is more strongly associated with self-reported disability, pain, disease interferences with daily activities, fatigue, and quality of life than with disease severity, except for a moderate association with lung severity.
(Less)
- author
- Mattsson, Malin ; Sandqvist, Gunnel LU ; Hesselstrand, Roger LU ; Nordin, Annica and Boström, Carina
- organization
- publishing date
- 2020-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Depression, Patient-reported outcome measures, Psychometrics, Quality of life, Scleroderma systemic
- in
- Rheumatology International
- volume
- 40
- issue
- 10
- pages
- 13 pages
- publisher
- Springer
- external identifiers
-
- pmid:32661929
- scopus:85087748331
- ISSN
- 0172-8172
- DOI
- 10.1007/s00296-020-04641-1
- language
- English
- LU publication?
- yes
- id
- 6945900e-a5c6-468f-8189-c9d5f18bebb2
- date added to LUP
- 2020-07-23 12:21:33
- date last changed
- 2024-03-20 13:43:53
@article{6945900e-a5c6-468f-8189-c9d5f18bebb2, abstract = {{<p>Background: Depressive symptoms are common in rheumatic diseases and influence patients’ quality of life. The Patient Health Questionnaire-9 (PHQ-9), which assesses symptoms of depression, is valid in English in patients with systemic sclerosis (SSc). However, the measurement properties of the PHQ-8 (short version of the PHQ-9) have not been evaluated in Swedish patients with SSc. Objective: To investigate different aspects of validity and reliability of the PHQ-8 in Swedish (PHQ-8 Swe) for individuals with SSc. Methods: A total of 101 patients with SSc participated. Content validity was evaluated via interviews of 11 patients and 10 health professionals. Construct validity, internal consistency test–retest reliability, and floor/ceiling effects were evaluated in 90 patients. Results: Content validity was satisfactory, but some linguistic adjustments were made. Confirmatory factor analysis supported a better fit for a two-factor structure. Moderate-to-strong correlations were found between the PHQ-8 Swe and scleroderma HAQ including VAS (r<sub>s</sub> = 0.4–0.7); Multidimensional Assessment of Fatigue (r<sub>s</sub> = 0.7); RAND-36 subscales (r<sub>s</sub> = − 0.5 to − 0.8); and lung disease severity (Medsger scores) (r<sub>s</sub> = 0.4). There were weak correlations (r<sub>s</sub> = <0.4) between the PHQ-8 Swe and modified Rodnan skin score; and vascular, heart, and kidney disease severity. Cronbach’s alpha was 0.85, corrected item-to-total correlations were >0.40, and the ICC for the total score was 0.83. No floor/ceiling effects were found. Conclusion: The PHQ-8 Swe has satisfactory content validity and sufficient reliability in patients with in majority limited SSc. It is more strongly associated with self-reported disability, pain, disease interferences with daily activities, fatigue, and quality of life than with disease severity, except for a moderate association with lung severity.</p>}}, author = {{Mattsson, Malin and Sandqvist, Gunnel and Hesselstrand, Roger and Nordin, Annica and Boström, Carina}}, issn = {{0172-8172}}, keywords = {{Depression; Patient-reported outcome measures; Psychometrics; Quality of life; Scleroderma systemic}}, language = {{eng}}, number = {{10}}, pages = {{1675--1687}}, publisher = {{Springer}}, series = {{Rheumatology International}}, title = {{Validity and reliability of the Patient Health Questionnaire-8 in Swedish for individuals with systemic sclerosis}}, url = {{http://dx.doi.org/10.1007/s00296-020-04641-1}}, doi = {{10.1007/s00296-020-04641-1}}, volume = {{40}}, year = {{2020}}, }