Abstract
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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | Journal of Dermatological Treatment |
| DOIs | |
| State | Accepted/In press - Feb 23 2017 |
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Keywords
- chronic plaque psoriasis
- context of use
- instrument
- PRO
- psychometric
- qualitative
ASJC Scopus subject areas
- Dermatology
Cite this
Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes. / Armstrong, April W.; Banderas, Benjamin; Foley, Catherine; Stokes, Jonathan; Sundaram, Murali; Shields, Alan L.
In: Journal of Dermatological Treatment, 23.02.2017, p. 1-10.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Development and psychometric evaluation of the self-assessment of psoriasis symptoms (SAPS) – clinical trial and the SAPS – real world patient-reported outcomes
AU - Armstrong, April W.
AU - Banderas, Benjamin
AU - Foley, Catherine
AU - Stokes, Jonathan
AU - Sundaram, Murali
AU - Shields, Alan L.
PY - 2017/2/23
Y1 - 2017/2/23
N2 - 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.
AB - 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.
KW - chronic plaque psoriasis
KW - context of use
KW - instrument
KW - PRO
KW - psychometric
KW - qualitative
UR - http://www.scopus.com/inward/record.url?scp=85014553673&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85014553673&partnerID=8YFLogxK
U2 - 10.1080/09546634.2017.1290206
DO - 10.1080/09546634.2017.1290206
M3 - Article
AN - SCOPUS:85014553673
SP - 1
EP - 10
JO - Journal of Dermatological Treatment
JF - Journal of Dermatological Treatment
SN - 0954-6634
ER -