Source: Summary statistics data from Marsh, H. W., and D. Hocevar. 1985. Application of confirmatory factor analysis to the study of self-concept: First- and higher order factor models and their invariance across groups. Psychological Bulletin 97: 562-582. http://doi.org/10.1037/0033-2909.97.3.562.
Data collected using the Self-Description Questionnaire and includes         sixteen subscales designed to measure nonacademic status: four intended         to measure physical ability, four intended to measure physical          appearance, four intended to measure relations with peers, and four          intended to measure relations with parents.
Group 1 is grade 4, group 2 is grade 5.
Summary statistics based on         134 students in grade 4 and         251 students in grade 5        from Sydney, Australia.