Short Form of Barratt Impulsiveness Scale (BIS-11-SF) Turkish Adaptation Study

Background: This study aims to conduct Turkish adaptation of abbreviated version of the Barratt Impulsiveness Scale (BIS-11). This short form (BIS-11-SF) would let the researchers easily use this impulsiveness scale in several different study fields including epidemiological studies, primary care and clinical samples. Methods: The present study was conducted in two stages. At the first stage, an exploratory factor analysis was carried out with 30-item BIS-11 which has been completed by 142 healthy participants. Through this analysis, 5 items with the highest factor loadings that belong to each of the three factors of the scale was determined. The final 15-item short form (BIS-15-SF) went on re-exploratory factor analysis and, internal consistency of the total scale and subscale scores were calculated. For validity analysis, the Frontal Systems Behavior Scale (FrSDa) was used. Ninety-two new subjects were included in this second stage. Results: At the first stage, 15 items of 30-item form that had sufficient rate of internal consistency and item-total correlation analysis have been included in factor analysis. The 3-factorial structure of the original 30-item scale [Non Planning (NP), motor impulsivity (M), and attention impulsivity (A)] was also valid in this short form. Internal consistency rates (Cronbach's alpha) for total and subscale scores of the 15-item new form were: 0.82, 0.80, 0.70 and 0.64 for total score, NP, M and D subscales, respectively. FrSDa (total scale and all subscales) had a moderately positive correlation (0.31-0.67) with BIS-11-SF total and subscale scores. Conclusion: Our findings show that the factorial structure of the Turkish adaptation of BIS-11 short form is reliable and valid for healthy normal population.