Fig. 2From: Structural validity of the Boston Carpal Tunnel Questionnaire and its short version, the 6-Item CTS symptoms scale: a Rasch analysis one year after surgeryPerson-item threshold distribution map for the CTS-6. Note in figure: Grouping set to interval length of 0,20, making 70 groups ‘Under 60yrs’ ‘At least 60yrs’Back to article page