Replication and Extension of the Organisational Health Improvement Questionnaire- Core (OHIQ-Core): Confirmatory Validation and Measurement Invariance in an Independent Sample

Background. The Organisational Health Improvement Questionnaire- Core (OHIQ-Core) is a brief 14-item measure of organisational psychological health developed for ongoing organisational use. Initial validation was previously conducted with 1,026 working adults, and supported a two-factor structure (Organisational Support and Work Design) and a higher-order unitary factor. Cross-validation in an independent sample, broader measurement invariance, and extended convergent validity evidence were the priorities for further validation work.Methods. The OHIQ-Core was tested in a new independent sample of 1,106 working adults. Confirmatory factor analysis compared single-factor, correlated two-factor, and higher-order models, with respecification replicated from the original validation. Measurement invariance was tested across gender, age, organisational size, disability status, and collapsed industry sectors. Convergent validity was examined against the WHO-5 Wellbeing Index, the Self-Rated Workplace Performance scale, and five single-item outcome indicators (n = 559).Results. The two-factor structure replicated, with the respecified model producing acceptable fit (CFI = .939, RMSEA = .072) and the higher-order solution yielding equivalent fit. Standardised loadings were significant and consistent with the original validation. Internal consistency was good for Organisational Support (ω = .90), the OHIQ-Core total (ω = .92), and acceptable for Work Design (ω = .77). Average variance extracted fell marginally below .50 for both subscales. Full scalar measurement invariance was established across all five grouping variables. Convergent validity replicated the original validation and was extended through the single-item outcomes. Organisational Support more strongly predicted attitudinal and wellbeing outcomes, while Work Design more strongly predicted self-rated performance.Conclusions. The OHIQ-Core's factor structure, reliability, and convergent validity replicate in an independent sample and demonstrate measurement equivalence across important demographic and organisational characteristics. The differential predictive pattern across subscales suggests distinct intervention targets for organisations seeking to improve relational and systemic versus structural and work-design aspects of organisational psychological health.