Evidence-based assessment of treatment outcomes for late-life generalized anxiety disorder using the Penn State Worry Questionnaire (PSWQ) and Penn State Worry Questionnaire - Abbreviated (PSWQ-A).

Findings suggest that most of the previously used definitions have underestimated the treatment effects for late-life GAD. However overall, the PSWQ and PSWQ-A are suboptimal for assessing treatment outcome for late-life GAD. The standardization of response and remission criteria has implications for comparison between treatment trials, and for the benchmarking of outcomes in clinical practice.