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Individual Differences Research > Volume 23 (2025) > e23005

Ego Identity, Self-Esteem, Locus of Control, and Purpose in Life Among College Students: A Mediation Analysis

Q. J. Miller

Abstract

This study examined whether self-esteem and locus of control mediate the relationship between ego identity and purpose in life among college students. A sample of 184 students completed the Ego Identity Scale, the Rosenberg Self-Esteem Scale, the Purpose in Life Test, and an abbreviated version of the Rotter Internal–External Locus of Control Scale. A parallel mediation model tested whether self-esteem and locus of control accounted for the association between ego identity and purpose in life. Ego identity positively predicted purpose in life both directly and indirectly through self-esteem. The indirect effect via self-esteem was significant, indicating partial mediation, whereas locus of control did not mediate or significantly predict purpose. Findings suggest that a coherent and accepting sense of self enhances purpose in life primarily through elevated self-worth rather than perceived control. Results emphasize self-esteem’s role in linking identity integration and existential meaning during younger adulthood.

RESEARCH ARTICLE

Published

November 14, 2025

Keywords

Ego identity;

Self-esteem;

Purpose in life;

Locus of control;

Mediation;

College students