Validity, reliability and factorial structure of the Turkish version of the Borderline Evaluation of Severity Over Time (BEST)

In this study, we aimed to examine the validity, reliability, and factor structure of the Borderline Evaluation of Severity Over Time scale in a Turkish sample. Participants were 306 (201 female, 105 male) college students at the Hasan Kalyoncu University. To examine internal consistency of the scale, Cronbach's Alpha reliability analysis was used. The Cronbach alpha coefficients for the Thoughts and Feelings, Negative Behaviors and Positive Behaviors subscales were 0.80, 0.65, and 0.67, respectively. For the whole scale, Cronbach's alpha coefficient was 0.75. The test-retest correlation coefficients for Thoughts and Feelings, Negative Behaviors and Positive Behaviors were 0.61, 0.50, and 0.51, respectively. A positive and statistically significant correlation was found between the Turkish BEST and BPQ (r=0.337, p<0.01), BDI (r=0.460, p<0.01), PBQ (r=0.337, r<0.01), State Anxiety (r=0.351, p<0.01) and Trait Anxiety (r=0.387, p<0.01) scales. Our results suggested that BEST is a valid and reliable tool to use in Turkish population. Keywords: Borderline Personality Disorder, Borderline Evaluation of Severity over Time, BEST