The Brief Symptom Inventory (BSI)

CPP Cohort 1

The Brief Symptom Inventory (BSI)* is a brief screening questionnaire used to assess adult self-report of psychological problems.  Domains assessed include somatization, depression, and anxiety symptoms; these comprise the Global Severity Index (GSI).

Descriptive Statistics:  Pre- and post-treatment assessment measure means, standard deviations, and standard errors for each subscale of the BSI and the Global Severity Index are listed in the table below, as well as the range of possible scores and clinically significant range for each subscale and GSI.

BSI Subscales: Descriptive Statistics

*Note: Scores are clinically significant if (1) Global Severity ≥ 63; or (2) two or more subscales (somatization, depression, and/or anxiety) ≥ 63.

Repeated Measures Analyses:  Paired samples t-tests were conducted to examine pre-post group mean differences on BSI subscales and global severity index.  Analyses showed statistically significant improvement in depression, anxiety, and global severity.  Please see the table and graph below for more information on these analyses.

BSI Subscales: Paired t-tests

BSI: Pre-post Treatment Mean Subscale And Global Severity Scores

*p < .05, **p < .01, ***p < .001

Individual Clinically-Significant Change:

At pre-treatment, 13 clients had BSI Global Severity Index scores at or above the clinical cut-off of 63.  No clients were missing post-treatment data for this scale.  Analysis showed that the BSI Global Severity Index score for 9 of these 13 clients (69%) decreased to non-clinically significant levels by post-treatment.  At pre-treatment, 11 clients had BSI Somatization scores at or above the clinical cut-off of 63.  No clients were missing post-treatment data for this scale.  Analysis showed that the BSI Somatization score for 3 of these 11 clients (27%) decreased to non-clinically significant levels by post-treatment.  At pre-treatment, 11 clients had BSI Depression scores at or above the clinical cut-off of 63.  No clients were missing post-treatment data for this scale.  Analysis showed that the BSI Depression score for 8 of these 11 clients (73%) decreased to non-clinically significant levels by post-treatment.  At pre-treatment, 10 clients had BSI Anxiety scores at or above the clinical cut-off of 63.  No clients were missing post-treatment data for this scale.  Analysis showed that the BSI Anxiety score for 7 of these 10 clients (70%) decreased to non-clinically significant levels by post-treatment.

*Derogatis, L. R. (2001). Brief Symptom Inventory (BSI)-18: Administration, scoring and procedures manual. Minneapolis, MN: NCS Pearson. http://www.pearsonclinical.com/psychology/products/100000638/brief-symptom-inventory-18-bsi-18.html

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