OBJECTIVES: The factor structure of the BPH-PSTQ was evaluated. METHODS: A cross sectional survey was conducted with BPH subjects that included the BPH-PSTQ. Exploratory factor analysis was conducted using maximum likelihood estimation and MINRES. Many criteria were evaluted to assess the number of factors including scree plots, the number of factors with eigenvalues greater then one, proportion of variance explained by factors, and various oblique and orthogonal rotations of the initial unrotated solution. RESULTS: A total of 768 subjects had complete data for analysis. The initial unrotated solution using maximum likelihood estimation left two factors with eigenvalues greater then one (25.2, 1.7). The variance explained by the dominant factor in the unrotated solution was 93%. Significance tests suggested that more then two factors were needed based upon chi-square results. Analysis of scree plot results demonstrated that there was one dominant factor and possibly a second factor that could be considered before there was a signicant plateau on the plot. Quartimax rotation demonstrated a one factor solution with questions 11 and 13 not loading very highly on the dominant factor (0.54, 0.53). Final communality estimate were also not as good for these two items. Other rotations confirmed the misfit of item 13. CONCLUSIONS: The unidimensionality of the BPH-PSTQ needs to be further explored to determine if there are multiple underlying factors with sub-scales or multiple distinct factors via confirmatory factor analysis modeling. Item 13 was the only item that did not seem to fit with any of the other items in the scale, and did not load well on any latent factors.