B.J. Moreton, M. Wheeler, D.A. Walsh, N.B. Lincoln

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Rasch analysis of the intermittent and constant osteoarthritis pain (ICOAP) scale B.J. Moreton, M. Wheeler, D.A. Walsh, N.B. Lincoln Osteoarthritis and Cartilage Volume 20, Issue 10, Pages 1109-1115 (October 2012) DOI: 10.1016/j.joca.2012.06.011 Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Person–item threshold distributions for the Constant subscale (a), Intermittent subscale (b) and Total scale (c). The top part of the graphs show the distribution of persons along the Rasch-transformed scale of constant, intermittent and total pain, respectively. The bottom part shows the distribution of items. Ideally, given good targeting, the two distributions should mirror one another such that the full range of trait expressed by participants is captured by the items on a scale. Osteoarthritis and Cartilage 2012 20, 1109-1115DOI: (10.1016/j.joca.2012.06.011) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 DIF across age groups for items 8 (a) and 9 (b) of the Total scale. Osteoarthritis and Cartilage 2012 20, 1109-1115DOI: (10.1016/j.joca.2012.06.011) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions