Development and Validation of an Aggression Questionnaire for Iranian Adolescents: A Case Study of 14 to 18-Year-Olds in Tehran

A cluster sampling method was employed for the quantitative phase. From Tehran's 22 educational districts, six (Districts 1, 5, 9, 13, 17, and 20) were randomly selected. Within each district, one girls' school and one boys' school were chosen at random. From each school, two classes ranging from seventh to eleventh grades were randomly selected. All students in these classes were considered potential participants. If any student or their parent opted out, another student from the same class was selected. In total, 1100 adolescents participated, with 1051 questionnaires completed. Demographic data collected included gender, age, parents' marital status, education, and occupation.