Fig. 1From: Cross-cultural adaptation and validation of the Amsterdam Instrumental Activities of Daily Living questionnaire short version German for SwitzerlandLatent trait distributions and test characteristic curves. The red dotted lines show the Swiss population and the solid black lines the Dutch reference group. a Latent trait distributions for the Dutch reference sample and the Swiss sample. b Test characteristic curves including all items for the Dutch reference sample and the Swiss sample. c Test characteristic curves including the three items with differential item functioning for the Dutch reference sample and the Swiss sampleBack to article page