Psychometric properties of the Dutch version of the Attitude Towards Deliberate Self-Harm Questionnaire.

The attitude of nurses and treatment staff is crucial in the treatment of patients who self-harm. However, many patients experience that attitude as negative. The aim of this study was to investigate the psychometric properties of the Dutch version of the Attitude Towards Deliberate Self-Harm Questionnaire. A total of 261 questionnaires were used to measure validity and reliability. Sensitivity to change was measured using a post-test measurement (n = 171) and a subgroup of 78 participants were given the questionnaire twice for test-retest measurement. Factor analysis revealed four factors explaining 33% of the variance. Cronbach's alpha values ranged 0.585-0.809, with 0.637 for the total scale. Intraclass correlation coefficient was assessed in order to estimate test-retest reliability, revealing the questionnaire was stable over time; the exception was factor 3, which had a value of 0.63. Sensitivity to change was found for the total score, factor one and two, and for three of the five items of factor three. We conclude that the Dutch version of the Attitude Towards Deliberate Self-Harm Questionnaire possesses adequate psychometric properties and is potentially an acceptable instrument for measuring the attitude of nurses and health-care staff towards patients who self-harm in Dutch-speaking countries.