Item Response Theory Analysis of Two Questionnaire Measures of Arthritis-Related Self-Efficacy Beliefs from Community-Based US Samples

<table>Information and standard error curves for a modified 9-item version of the the 5-item Pain and 6-item Other Symptoms subscales from Arthritis Self-efficacy scale.</table>

Arthritis

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Figure 2

Figure 2: Item Response Theory Analysis of Two Questionnaire Measures of Arthritis-Related Self-Efficacy Beliefs from Community-Based US Samples 