Practical Significance of Longitudinal Measurement Invariance Violations in the Dutch–Flemish PROMIS Item Banks for Depression and Anxiety: An Illustration With Ordered-Categorical Data

We investigated longitudinal measurement invariance in the Dutch-Flemish PROMIS adult v1.0 item banks for Depression and Anxiety using two clinical samples with mood and anxiety disorders ( n = 640 and n = 528, respectively). Factor analysis was used to evaluate whether the item banks were sufficiently unidimensional at two test-occasions and whether the measured constructs remained the same over time. The results indicated that the item banks were sufficiently unidimensional, but the thresholds and residual variances of the constructs changed over time. However, using tentative rules of thumb... Mehr ...