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Reconstructing the Rasch-Built Myotonic Dystrophy Type 1 Activity and Participation Scale

Fig 1

External construct convergent validity and test-retest reliability for DM1-ActivC.

The 25-item DM1-ActivC scale demonstrates high external construct/convergent validity with the 20-items DM1-Activ (A). Patients’ ability (B) and items’ difficulty hierarchy (C) in the first and second assessment are located within the 95% confidence intervals indicating ideal invariance (solid lines).

Fig 1

doi: https://doi.org/10.1371/journal.pone.0139944.g001