CPP Cohort 4
The Patient Health Questionnaire 9 (PHQ-9)* is a self-report questionnaire for adult caregivers of depressive symptoms and behaviors. Higher scores indicate greater severity of depression.
Descriptive Statistics: Pre- and post-treatment assessment measure means, standard deviations, and standard errors for the PHQ-9 are listed in the table below, as well as the range of possible scores.
PHQ-9: Descriptive Statistics
Repeated Measures Analyses: Paired samples t-tests were conducted to examine pre-post group mean differences for the PHQ-9 overall score. Analyses did not show statistically significant change in the PHQ-9 overall score.
PHQ-9: Paired Sample T-Test
PHQ-9: Pre-Post Mean Scores
Individual Clinically Significant Change: Individual clinically significant change for the PHQ-9 overall score was based on the suggested screening cut-point of 10. At pre-treatment, 7 clients had PHQ-9 overall scores at or above the cut-point of 10. Of note, 5 of these 7 clients were missing the PHQ-9 overall score at post-treatment. Analysis of the clients with post-treatment data showed that the PHQ-9 overall score for 1 of the 2 clients (50%) decreased below the cut-point of 10.
*Kroenke, K., Spitzer, R.L., & Williams, J.B.W. (2001). The PHQ-9: Validity of a Brief Depression Severity Measure. Journal of General Internal Medicine, 16(9), 606–613