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. 2021 Jan 13;3(1):100103. doi: 10.1016/j.arrct.2021.100103

Fig 2.

Fig 2

Person-item distribution map for the WIS-23. The mean of person logits is equal to 0.24 (<1 logit), indicating that the scale item difficulty matches the abilities of the sample. In addition, the floor and ceiling effects were not detected as only 6% (<10%) of the participants were on either end of the spectrum.