PHYSICAL SELF DESCRIPTION QUESTIONNAIRE - STABILITY AND DISCRIMINANT VALIDITY

The Physical Self-Description Questionnaire (PSDQ) is a multidimension al, physical self-concept instrument designed to measure II scales: St rength, Body Fat, Activity, Endurance/Fitness, Sports Competence, Coor dination, Health, Appearance, Flexibility Global Physical Self-concept , and Global Esteem. High school students completed the PSDQ on four o ccasions over a 14-month period. Across the II PSDQ scales, the intern al consistency at each occasion was good (median alpha = .92) and the stability over time varied from median r = .83 for a 3-month period to median r = .69 for the 14-month period. The data were used to demonst rate the application of confirmatory factor-analysis models of multitr ait-multimethod (MTMM) data (with occasions as the multiple methods), which supported the discriminant validity of the PSDQ scales. Augmente d MTMM models that included two field tests of cardiovascular enduranc e provided additional support for the construct validity of PSDQ respo nses and interpretations of the MTMM models. These results contribute to the growing body of support for the construct validity of physical- self-concept responses and illustrate the application of CFA MTMM mode ls.