Data are collected from German university sport and psychology students (N = 605, 270 males and 335 females). Both CFA and MRM analyses are conducted.
CFA results show acceptable goodness-of-fit indices for the 11-factor solution. The majority of the 11 MRM analyses indicate that the PSDQ scales can be considered unidimensional in the sense of a Rasch model for polytomous data. However, the scales physical activity, physical self-concept, and strength reveal shortcomings.
For a rather large proportion of yet undefined persons the PSDQ may be problematic for diagnostic purposes, and researchers and practitioners should be aware of this. Future studies should also consider MRM analyses with samples from different age categories and manifest groups, which can be tested against statistically established latent groups.