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. 2022;100(1):49-55.

Assessing the validity and interpretability of the Simplified Psoriasis Index in Tunisian patients

Ines Chabchoub, Noureddine Litaiem, Soumaya Gara, Kahena Jaber, Mohamed Abderraouf Dhaoui, Faten Zeglaoui

Assessing the validity and interpretability of the Simplified Psoriasis Index in Tunisian patients

Ines Chabchoub et al. Tunis Med. 2022.

Abstract
in English, French

Introduction: Multiple scores have been developed to assess the severity of psoriasis, but these scores have many limitations. The Simplified Psoriasis Index (SPI) is a summary score with separate components for current severity (SPI-s), psychosocial impact (SPI-p), and past history and interventions (SPI-i). It is available in two similar versions: proSPI and saSPI.

Aim: To assess the validity of the SPI by studying its correlation to the benchmark scores in Tunisian patients.

Methods: It was a prospective bicentric study including 80 patients with plaque psoriasis.

Results: The median PASI was 7.6 and the median DLQI was 9. The median proSPI-s was 6 and the median saSPI-s was 8. The median SPI-p was 7. The median SPI-i was 2. There was a strong correlation between the proSPI-s and PASI (r=0.87) and between the proSPI-s and saSPI-s (r=0.82). There was a medium correlation between saSPI-s and PASI (r=0.70) and between SPI-p and DLQI (r=0.67). The threshold value for proSPI-s and saSPI-s was 7.25. The threshold value for SPI-p was 6.5.

Conclusion: The SPI aims to provide a concise but global measure of the severity and impact of psoriasis on quality of life. The use of SPI has several advantages: the simplicity of use, the additional weight given to critical locations of psoriasis, the possibility for the patient to self-assess his own disease, and the possibility of evaluating all the dimensions of psoriasis at the same time.

Introduction: Plusieurs scores ont été développés permettant d’évaluer la sévérité du psoriasis. Malgré leur utilisation large, ces scores présentent de nombreuses limites. Le Simplified Psoriasis Index (SPI) est un score de sévérité qui comprend trois variables distinctes : la sévérité actuelle de la maladie (SPI-s), son impact psychosocial (SPI-p), et l’historique de la maladie psoriasique et de ses traitements (SPI-i). Le SPI est décliné en deux versions similaires : l’une est remplie par le médecin (proSPI) et la deuxième par le patient (saSPI).

Objectif : Evaluer la validité du SPI en étudiant sa corrélation aux scores de référence chez les patients tunisiens.

Méthodes :Étude prospective bi-centrique incluant 80 patients atteints de psoriasis en plaques.

Résultats : Le PASI médian était de 7,6. Le DLQI médian était de 9. Le proSPI-s médian était de 6 et le saSPI-s médian était de 8. Le SPI-p médian était de 7. Le SPI-i médian était de 2. Il existait une corrélation forte entre les scores proSPI-s et PASI (r=0,87) et entre les scores proSPI-s et saSPI-s (r=0,82). Il y’avait une corrélation moyenne entre le saSPI-s et le PASI (r=0,70) et entre le SPI-p et le DLQI (r=0,67). La valeur seuil de sévérité du proSPI-s et du saSPI-s était de 7,25. La valeur seuil de sévérité du SPI-p était de 6,5.

Conclusion : Le SPI vise à fournir une mesure concise et globale de sévérité et de l’impact du psoriasis sur la qualité de vie. L’utilisation du SPI présente plusieurs avantages : la simplicité d’utilisation, la pondération supplémentaire accordée aux localisations critiques du psoriasis sur le plan fonctionnel et psychosocial, la possibilité pour le patient de s’autoévaluer, et la possibilité d’évaluer à la fois toutes les dimensions du psoriasis.

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Figures

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Figure 1: Correlation between the professional simplified psoriasis index-current severity score (proSPI-s) and the Psoriasis Area and Severity Index (PASI).
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Figure 2. Correlation between the self-assessment simplified psoriasis index-current severity score (proSPI-s) and the Psoriasis Area and Severity Index (PASI).
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Figure 3. Correlation between the simplified psoriasis indexpsychosocial impact score (SPI-p) and the Dermatology Life Quality Index (DLQI)
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Figure 4. Response distribution for professional simplified psoriasis index-current severity score (proSPI-s)
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Figure 5. Response distribution for self-assessment simplified psoriasis index-current severity score (saSPI-s)
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Figure 6. Response distribution of the simplified psoriasis indexpsychosocial impact score (SPI-p)
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