The Penn State Worry Questionnaire (PSWQ) is a 16-item self-report scale for measuring the excessiveness and uncontrollability of worry. The current study examined the factor structure of the PSWQ in (1) a large community sample (N = 455), and (2) a clinical sample of patients with generalized anxiety disorder (GAD; N = 102), the disorder for which worry is the key feature. Confirmatory factor analysis was employed to test three models: (1) a one-factor model in which all items loaded on one and the same dimension, (2) a two-factor model in which positively and negatively worded items loaded on two separate but correlated factors, and (3) a one-factor model, that included the reverse items as a method factor. In the community sample the one-factor/method factor model provided the best fit for the data. This was also true in the clinical GAD sample, but only after error covariances between a number of items were allowed to correlate.

Factor analysis, Generalized anxiety disorder, Self-report questionnaire, Worry
dx.doi.org/10.1016/j.jbtep.2010.02.009, hdl.handle.net/1765/82161
Journal of Behavior Therapy and Experimental Psychiatry: a journal of experimental psychopathology
Department of Psychology

van der Heiden, C, Muris, P.E.H.M, Bos, A.E.R, & van der Molen, H.T. (2010). Factor structure of the Dutch version of the Penn State Worry Questionnaire. Journal of Behavior Therapy and Experimental Psychiatry: a journal of experimental psychopathology, 41(3), 304–309. doi:10.1016/j.jbtep.2010.02.009