Figure 2.

OMERACT Summary of evidence for measurement properties of PsAID12. Color designates quality of evidence: dark grey stands for green=good methods used, use this evidence; light grey stands for amber=some cautions but we will use this evidence. In the rating row, color designates overall evidence-based instrument rating for the core instrument set: dark grey stands for green= at least 2 pieces of evidence with good methods and consistent findings of adequate or better performance; light grey stands for amber=in between green and red; red= inadequate performance in at least 1 study that used good methods, white=no evidence. Arithmetic signs designate the performance of the instrument according to that study (for each measurement property studied): “+”adequate or better performance, “+/−”equivocal performance, “-”less than adequate/poor performance. Abbreviations: TAG OMERACT Technical advisory group