A Reevaluation of the Simplified Psoriasis Index (SPI) Using the Thai Language Version: A Study Examining the Validity, Reliability, and Interpretability of SPI When Used in Translation:

Background:The Simplified Psoriasis Index (SPI) is a summary measure of psoriasis for current severity (SPI-s), psychosocial impact (SPI-p), and past history and interventions (SPI-i). Two compleme...