The Relative Age Effect and Its Influence on Academic Performance.

Area of Science:

• Educational Psychology
• Sociology of Education
• Developmental Psychology

Background:

• Student grouping by age, based on birth date, can create a relative age effect (RAE).
• Older students often show better academic performance due to maturation and experience, a phenomenon known as RAE.
• RAE's influence is more pronounced in younger students.

Purpose of the Study:

• To investigate the influence of RAE, socioeconomic status (SES), and institution type on 8th graders' academic performance.
• To identify the interrelationships between RAE, SES, and academic outcomes in a Chilean 8th-grade population.

Main Methods:

• Analysis of a representative sample of 15,234 8th graders from Chile's 2011 SIMCE survey.
• Academic performance measured through tests in reading, mathematics, social studies, and science.
• Structural equation modeling used to assess the impact of RAE, SES, and school type, controlling for age groups (G1-oldest to G5-youngest).

Main Results:

• Structural equation modeling showed significant effects of RAE, SES, and institution type on academic performance, with SES having the largest impact.
• RAE influenced performance in the full sample and subsamples, particularly affecting students with lower academic scores.
• Controlling for SES reduced RAE's influence, but it remained a significant explanatory factor for academic performance.

Conclusions:

• RAE continues to be an explanatory factor in 8th graders' academic performance, even with residual effects.
• Adverse RAE effects are likely concentrated in the initial stages of formal schooling.
• Findings support considering flexible age-of-entry policies and implementing early, comprehensive neurodevelopmental evaluations.