Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes
Objective: The Self-Assessment of Psoriasis Symptoms – Clinical Trials (SAPS-CT) and SAPS – Real World (SAPS-RW) were simultaneously created to assess the experience of plaque psoriasis in two unique contexts. Methods: Qualitative and quantitative research was conducted in four phases namely concept...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2017-08-01
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| Series: | Journal of Dermatological Treatment |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/09546634.2017.1290206 |
| _version_ | 1797683733869887488 |
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| author | April W. Armstrong Benjamin Banderas Catherine Foley Jonathan Stokes Murali Sundaram Alan L. Shields |
| author_facet | April W. Armstrong Benjamin Banderas Catherine Foley Jonathan Stokes Murali Sundaram Alan L. Shields |
| author_sort | April W. Armstrong |
| collection | DOAJ |
| description | Objective: The Self-Assessment of Psoriasis Symptoms – Clinical Trials (SAPS-CT) and SAPS – Real World (SAPS-RW) were simultaneously created to assess the experience of plaque psoriasis in two unique contexts. Methods: Qualitative and quantitative research was conducted in four phases namely concept elicitation, questionnaire construction, content evaluation and psychometric evaluation. Results: Following concept elicitation, 18 concepts were selected to inform questionnaire construction of the SAPS-CT and SAPS-RW. To accommodate each context of use, the SAPS-CT asks respondents to rate the target symptom ‘at its worst’ in the 24 h prior to assessment, while the SAPS-RW asks respondents to rate the target symptom “on average” in the 7 days prior to assessment. Cognitive debriefing confirmed that patients could comprehend and provide meaningful responses to both versions and, after minor modifications, resulted in 11-item questionnaires administered in an observational study (N = 200). Results from the observational study informed further item reduction (SAPS-RW to six items and SAPS-CT to nine items) and demonstrated that scores from each were reliable (Cronbach’s α > 0.90, test–retest intraclass correlation coefficient >0.70), construct valid and able to differentiate among clinically distinct groups. Conclusion: The SAPS-CT and SAPS-RW are content-valid PRO questionnaires capable of producing psychometrically sound scores when administered chronic to plaque psoriasis patients. |
| first_indexed | 2024-03-12T00:20:07Z |
| format | Article |
| id | doaj.art-49b1aba40f124770a9a45fb3356f6d80 |
| institution | Directory Open Access Journal |
| issn | 0954-6634 1471-1753 |
| language | English |
| last_indexed | 2024-03-12T00:20:07Z |
| publishDate | 2017-08-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of Dermatological Treatment |
| spelling | doaj.art-49b1aba40f124770a9a45fb3356f6d802023-09-15T14:08:30ZengTaylor & Francis GroupJournal of Dermatological Treatment0954-66341471-17532017-08-0128650551410.1080/09546634.2017.12902061290206Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomesApril W. Armstrong0Benjamin Banderas1Catherine Foley2Jonathan Stokes3Murali Sundaram4Alan L. Shields5University of Southern CaliforniaAdelphi Values USA, Patient-Centered OutcomesAdelphi Values USA, Patient-Centered OutcomesAdelphi Values USA, Patient-Centered OutcomesAbbVie, Health Economics and Outcomes ResearchAdelphi Values USA, Patient-Centered OutcomesObjective: The Self-Assessment of Psoriasis Symptoms – Clinical Trials (SAPS-CT) and SAPS – Real World (SAPS-RW) were simultaneously created to assess the experience of plaque psoriasis in two unique contexts. Methods: Qualitative and quantitative research was conducted in four phases namely concept elicitation, questionnaire construction, content evaluation and psychometric evaluation. Results: Following concept elicitation, 18 concepts were selected to inform questionnaire construction of the SAPS-CT and SAPS-RW. To accommodate each context of use, the SAPS-CT asks respondents to rate the target symptom ‘at its worst’ in the 24 h prior to assessment, while the SAPS-RW asks respondents to rate the target symptom “on average” in the 7 days prior to assessment. Cognitive debriefing confirmed that patients could comprehend and provide meaningful responses to both versions and, after minor modifications, resulted in 11-item questionnaires administered in an observational study (N = 200). Results from the observational study informed further item reduction (SAPS-RW to six items and SAPS-CT to nine items) and demonstrated that scores from each were reliable (Cronbach’s α > 0.90, test–retest intraclass correlation coefficient >0.70), construct valid and able to differentiate among clinically distinct groups. Conclusion: The SAPS-CT and SAPS-RW are content-valid PRO questionnaires capable of producing psychometrically sound scores when administered chronic to plaque psoriasis patients.http://dx.doi.org/10.1080/09546634.2017.1290206prochronic plaque psoriasisinstrumentcontext of usequalitativepsychometric |
| spellingShingle | April W. Armstrong Benjamin Banderas Catherine Foley Jonathan Stokes Murali Sundaram Alan L. Shields Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes Journal of Dermatological Treatment pro chronic plaque psoriasis instrument context of use qualitative psychometric |
| title | Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes |
| title_full | Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes |
| title_fullStr | Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes |
| title_full_unstemmed | Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes |
| title_short | Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes |
| title_sort | development and psychometric evaluation of the self assessment of psoriasis symptoms saps clinical trial and the saps real world patient reported outcomes |
| topic | pro chronic plaque psoriasis instrument context of use qualitative psychometric |
| url | http://dx.doi.org/10.1080/09546634.2017.1290206 |
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