Fig. 3From: Validation of the Dutch version of the Swallowing Quality-of-Life Questionnaire (DSWAL-QoL) and the adjusted DSWAL-QoL (aDSWAL-QoL) using item analysis with the Rasch model: a pilot studyItem characteristic curve displaying a uniform DIF. Item characteristic curve displaying a uniform DIF for item 5. Despite the equal ability level, the three groups responded differently. The cognitive group obtained a prominently lower score than those of the two other groupsBack to article page