TY - JOUR T1 - The Psoriasis Symptom Inventory: An Effective Patient-reported Outcome Measure of Psoriasis Severity JF - The Journal of Rheumatology JO - J Rheumatol SP - 1034 LP - 1036 DO - 10.3899/jrheum.150127 VL - 42 IS - 6 AU - Philip J. Mease Y1 - 2015/06/01 UR - http://www.jrheum.org/content/42/6/1034.abstract N2 - There is a need for simple, practical, and reliable measurement instruments for use in clinical trials, registries, and clinical practice to assess psoriasis severity and the change in symptoms with treatment. The Psoriasis Area and Severity Index (PASI) is the standard measure of psoriasis used in clinical trials, but it is rarely used in clinical practice and it is not readily used in clinical registries because of its complexity. The Physician Static Global Assessment score is a simpler measure also used in clinical trials and less frequently in registries and practice, but like the PASI, it requires some degree of experience to score. The Psoriasis Symptom Inventory (PSI) was developed as a simple measure to enable patients to self-score psoriasis severity. It has been demonstrated to be reliable and discriminative, and it correlated with the PASI score in a psoriasis clinical trial. It also was recently validated to assess psoriasis in a psoriatic arthritis (PsA) clinical trial. The PSI may be a useful and practical measure of psoriasis severity in psoriasis and PsA clinical trials, registries, and in clinical practice. ER -