Cross-cultural adaptation and psychometric properties of the European Portuguese version of the Global Perceived Effect Scale in patients with chronic low back pain

Abstract

The GPES demonstrated adequate psychometric properties. This study's findings supported its use in clinical and research studies with patients with chronic low back pain.IMPLICATIONS FOR REHABILITATIONThe European Portuguese version of the Global Perceived Effect Scale demonstrated adequate reliability, validity and responsiveness. This instrument is suitable to evaluate meaningful changes in patients with chronic low back pain.The contribution of baseline status to GPES scores was confirmed by specific and recommended methods. The use of the GPES as external criterion of change in clinimetric studies was supported.The minimum important change was 2.5 points out of 11 of the GPES. Only improvements above this point should be considered as relevant to patients with chronic low back pain undergoing physiotherapy.