Fig. 3

Person-item threshold distribution of the J-EAT-10 responses. The x-axes display location of item thresholds (lower half) and location of respondents’ summated OD severity on J-EAT-10 (upper half). The y-axes display the frequencies of item thresholds (lower half) and respondents (upper half). High scores imply higher OD severity and low scores imply lower OD severity. a The J-EAT-10 responses of the full sample and b the J-EAT-10 responses grouped as dependent and independent respondents. For both graphs, the item thresholds spread over about 7 logits, with evidence of floor effects (a high percentage of respondents achieved the lowest possible score of zero), but not ceiling effects. Some item-thresholds are in the same place, which indicates that they are duplicating the ability to discriminate at that level of difficulty. Some areas along the logit scale are not represented by item thresholds