The Professional Counselor | Volume 12, Issue 3 207 Table 2 Ratings for OQ-45.2 Total Scale Score by Participants Age Ethnicity Gender Baseline Data Intervention Data PND τU (p) PI M SD M SD Mary 31 Latina Female 45.25 16.25 17.67 7.44 100% −1.00 (.01) 60.95% Joel 20 Latino Male 84.00 6.00 47.10 10.74 100% −1.00 (.004) 43.93% Note. PND = Percentage of Non-overlapping Data. Before treatment began, one of Mary’s baseline measurements was above the cut-score guideline on the OQ-45.2 of a total scale score of 63, which indicates symptoms of clinical significance. Comparison of level of clinical symptoms across baseline (M = 45.25) and intervention phases (M = 17.67) indicated notable changes in participant scores evidenced by a decrease in mental health symptom scale scores over time. Variation between scores in baseline (SD = 16.25) and intervention (SD = 7.44) indicated differential range in scores before and after the intervention. Data in the baseline phase trended upward toward a contra-therapeutic effect over time. Dissimilarly, data in the intervention phase trended downward toward a therapeutic effect over time. Comparison of baseline level and trend data with the first three observations in the intervention phase did suggest immediacy of treatment response for the participant. Data in the intervention phase moved into the desired range of effect for scores representing mental health symptoms. Mary’s ratings on the OQ-45.2 illustrate that the treatment effect of SFBT was very effective for decreasing her total scale score measuring mental health symptoms. Evaluation of the PND statistic for the OQ-45.2 total scale score measure (1.00) indicated that all six scores were on the therapeutic side below the baseline (total scale score of 26). Mary successfully reduced clinical symptoms during treatment as evidenced by improved scores on items such as “I am a happy person,” “I feel loved and wanted,” and “I find my work/school satisfying.” This contention became most apparent after the first treatment session when Mary continuously scored lower on a majority of symptom dimensions such as Symptom Distress, Interpersonal Relations, and Social Role Performance. Scores below the PND line were within a 24-point range. Trend analysis depicted a consistent level of improvement following the first treatment measure. This finding is corroborated by the associated Tau-U value (τU = −1.0), which suggested a very large degree of change in which the null hypothesis about intervention efficacy for Mary could be rejected (p = .01). An analysis of statistical process control charting revealed that one data point in the treatment phase was beyond the realm of random occurrence with 99% confidence. This finding also corresponds with interpretation of the clinical significance estimate of PI that 60.95% improvement is clinically significant (Lenz, 2020a, 2020b). See Table 2 for information regarding PND, Tau-U, and PI. In the context of Mary’s treatment and a visual representation of Mary’s scores on the OQ-45.2 (see Figure 2), the SFBT intervention had a high level of convincingness, which means that a considerable amount of change in clinical symptoms occurred for Mary (Kendall et al., 1999; Lenz, 2021).
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