Fig. 7From: Structural validity of the Boston Carpal Tunnel Questionnaire and its short version, the 6-Item CTS symptoms scale: a Rasch analysis one year after surgeryDifferential item functioning by gender in item 7 (“Do you have weakness in your hand or wrist?”) of the BCTQ Symptom Severity Scale. Note in figure: ‘Some person location values … decrease minimum location’ and ‘Person location’Back to article page