This study examines the construct validity of an original self-report instrument for the assessment of mental toughness: the Sports Mental Toughness Questionnaire (SMTQ). Two independent studies supported a three-factor (Confidence, Constancy, and Control) 14-item model for the SMTQ. With a sample of 633 athletes (427 males, 206 females; M age = 21.5 years; SD = 5.48), drawn from 25 sport classifications, and competing at international, national, county and provincial, or club and regional standards, the first study utilized item development and exploratory factor analytic techniques to establish the psychometric properties of the SMTQ. Study 2 employed confirmatory factor analytic techniques with an independent sample of 509 sports performers (351 males, 158 females; M age = 20.2 years; SD = 3.35), competing at the aforementioned standards, and representative of 26 sports. Confirmatory analysis using structural equation modeling confirmed the overall structure. A single factor underlying mental toughness (G mt ) was identified with higher-order exploratory factor analysis using the Schmid-Leiman procedure. Collectively, satisfying absolute and incremental fit-index benchmarks, the inventory was shown to possess satisfactory psychometric properties, with adequate reliability, divergent validity, and discriminative power. The results revealed promising features of the SMTQ, lending preliminary support to the instrument's factorial validity and reliability. Further construct validation of the SMTQ is recommended, including its use as an index for evaluating the effect of intervention programs.

The findings have implications for universities targeting academic support services to maximize student scholastic potential. Future research should incorporate hardiness, gender, and age with other variables known to predict academic success.

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