The assessment of bystander intervention in bullying: Examining measurement invariance across gender.

Research on bystander intervention in bullying has indicated that prosocial helping behavior is not consistent across gender, with girls engaging in more bystander intervention; however, a search of the literature does not reveal any studies that have examined the validity of bystander intervention measurement across subpopulations. The purpose of the current study was to investigate measurement invariance across gender in both the elementary and middle school versions of the Bystander Intervention Model in Bullying measure among a sample of 682 fourth to eighth grade students (46% girls, 47% low income, 87% White). Results suggest evidence of measurement equivalence of the five-step bystander intervention model across gender in the elementary and middle school samples. Given this, there is evidence that the measure can be used for research and practical purposes in these grade levels and that comparisons between boys and girls are appropriate.