Fig. 2From: Psychometric properties of the painDETECT questionnaire in rheumatoid arthritis, psoriatic arthritis and spondyloarthritis: Rasch analysis and test-retest reliabilityItem-person map illustrating the threshold distributions. The most difficult items and the person with most severe neuropathic pain are shown at the left. Each item is shown in three rows representing different rating scale measures. Items; Center: the mean item difficulty calibration. Bottom: measure level corresponding to a probability of 0.5 of being rated in the lowest category of the rating scale. Top: measure level coresponding to a probability of 0.5 of being rated in the highest category of the scaleBack to article page