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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Qual Life Res. 2016 Apr 1;25(10):2417–2427. doi: 10.1007/s11136-016-1273-y

Figure 4.

Figure 4

Swallowing Difficulties Number of CAT Items by CAT Theta

Caption: This figure shows the number of CAT items used for different scale scores in standard deviation units (circles represent individual simulated observations): at −1 SD units, the CAT always used all 15 items in the item bank; from +0.4 to +2.2 SD units, the CAT always used the minimum number of 4 items in the item bank; and at 3 SD units the CAT used all 15 items in the item bank.