Validation and measurement invariance of the childhood trauma questionnaire short form among incarcerated men and women in Spain

Background: Childhood trauma is highly prevalent among incarcerated individuals and contributes to a range of negative outcomes. Assessing traumatic childhood events in prison settings requires valid, reliable, and effective instruments. Objectives and methods: This study evaluated the performance of the Childhood Trauma Questionnaire - Short Form (CTQ-SF), originally developed and validated in English, within a sample of incarcerated men and women (n = 1118 and n = 207, respectively) in six Spanish prisons. Results: The results indicated that the CTQ-SF had an acceptable fit in our sample. However, the internal consistency of the Physical Neglect subscale was found to be deficient (α = 0.57), especially among women (α = 0.43). This finding aligns with previous research across different contexts, which may signal weaknesses in the original construction of this subscale. The CTQ-SF demonstrated limited invariance between men and women, with only configural invariance being achieved, constraining the comparisons that can be made across sexes. In the absence of scalar invariance, comparisons of factor means to assess severity may be misleading, and caution is recommended when comparing prevalence estimates for men and women in Spanish prisons. Nonetheless, our findings support the convergent validity of the CTQ-SF, as trauma severity showed moderate correlations with depression, anxiety, stress, and aggression. Conclusions: These results underscore the importance of evaluating the performance of instruments across various cultural contexts and populations to ensure the validity of study conclusions.