Psychometric Properties of the Subjective Vitality Scale for Mothers of Children with Intellectual Disabilities

Aims: This study aimed to examine the psychometric properties of the Subjective Vitality Scale among mothers of children with intellectual disabilities by verifying its validity, reliability, and suitability for the research context in which it was applied. It also sought to provide a scientifically accurate measurement tool that can be relied upon in future psychological studies involving this population, given the importance of subjective vitality in understanding the psychological and emotional aspects of mothers. Methodology: The study sample consisted of 186 mothers of children with intellectual disabilities in the Asir region (KSA). To assess validity, face validity was used by presenting the scale items to a panel of psychology experts, with an agreement rate exceeding 90% regarding the suitability of the items to the study objectives. Confirmatory Factor Analysis (CFA) was also conducted to examine the construct validity of the scale, showing a good fit between the theoretical model and the observed data. For reliability, multiple statistical indicators were employed, including omega coefficient, split-half reliability, and Cronbach’s alpha, to ensure internal consistency and stability across dimensions. Results: The findings showed that omega coefficients for the sub-dimensions ranged between 0.61 and 0.81, while the overall reliability value reached 0.85, indicating a good level of reliability. The split-half reliability coefficient was 0.81, reflecting acceptable stability in measurement. Cronbach’s alpha results also indicated high internal consistency among the scale items, and all correlation coefficients were statistically significant at the 0.01 level, confirming item homogeneity and consistency in measuring the same construct. Conclusions: The study concluded that the Subjective Vitality Scale for mothers of children with intellectual disabilities possesses good psychometric properties in terms of validity and reliability, making it a suitable and trustworthy instrument for use in psychological and educational research. It can also be applied in future studies aimed at understanding the psychological aspects of this group and in developing counseling and psychological support programs based on accurate scientific evidence.