Introduction: Risk behaviors contribute to leading causes of death and reduced quality of life among adolescents and youth. The purpose of this study was to investigate the factor structure, validity, and reliability of the checklist of risk behaviours for youth (CORBY).
 
Materials & Methods: The research was descriptive. A sample of 533 middle school and high school students were selected with multistage cluster sampling of students of Tehran. To calculate the convergent and divergent validity, Children’s Depression Inventory, Oxford Happiness Questionnaire, and Catastrophic Cognitions Questionnaire were used. In order to assess the first order confirmatory factor of the risk behaviors for youth (CORBY), the weighted lowest squares (WLS) and to assess the adequacy of the model to the data, the parameters of RMR ،­RMSEA ،­CFI ،­AGFI ،­GFI ،x²، x²/ df were used. Data analysis was conducted by SPSS.16 and Lisrel 8.80.
 
Findings: The average score for boys in all three levels of high-risk behavior is higher compared with an average score of girls. Factor structure of the CORBY was confirmed with using confirmatory factor analysis. Correlation analysis showed that the CORBY with Children's Depression Inventory (P<0.01) Cognitive catastrophizing (P<0.01) has a significant positive correlation which indicates convergent validity and a significant negative correlation with the Oxford Happiness Questionnaire (P<0.01) indicates its divergent validity. Cronbach's alpha subscales of level one, two, and three, respectively, 0.74, 0.69, 0.75 and retest coefficients, respectively, 0.71, 0.82 and 0.70 were obtained.
 
Discussion & Conclusions: First-order factor structure of the three-factor “CORBY “showed better fitness with the observed data. Based on the findings, the checklist of risk behaviours for youth has acceptable psychometric properties.