Self-Description Questionnaire II-Short (SDQ-II-S): Measurement properties in Spanish adolescents

Self-concept is a fundamental construct that is related to many positive and negative aspects of life. It plays an essential role in adolescence, due to the important biological, social and psychological changes that occur at this stage, and is a determining factor in the academic environment. In order to have appropriate instruments for its assessment, the aim of the study was to analyse the measurement properties and adapt the short version of the Self-Description Questionnaire II (SDQ-II-S) in Spanish adolescent. A sample of 726 secondary school students aged between 12 and 18 years (M= 15.44, SD= 1.41) participated. Descriptive analysis, correlation analysis, confirmatory factor analysis, reliability and invariance analysis were conducted. The different analyses confirmed the multidimensional structure of the questionnaire, with adequate factor loadings, satisfactory goodness-of-fit indices, convergent validity, and corroborated gender invariance. Composite reliability of the dimensions ranged from .70 to .92. In conclusion, the SDQ-II-S is an instrument with appropriate characteristics, valid and reliable for the assessment of self-concept in Spanish students in adolescence.