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Updated: Oct 26, 2026

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil
Published on: July 29, 2020
Brazilian version of the Vaccine Trust Gauge for adolescents
Vanessa Mara da Silva1, Liza Motta Lima2, Matheus Correia da Silva1
1Federal University of Mato Grosso (UFMT), Cuiabá, Mato Grosso, Brazil.
Aim:
To cross-culturally adapt the Vaccine Trust Gauge (VTG) for the Brazilian context and evaluate its content validity, structural validity, internal consistency, and test-retest reliability among adolescents.
Methods:
This methodological study involved the cross-cultural adaptation of the VTG and the evaluation of its content validity, structural validity, internal consistency, and test-retest reliability. Content validity was assessed by an expert committee. Pre-testing was conducted with adolescents to evaluate clarity and acceptability. Internal structure was examined using confirmatory factor analysis (CFA) with the weighted least squares mean and variance adjusted estimator for ordinal data. Reliability was assessed using McDonald's omega and test-retest analysis with the intraclass correlation coefficient (ICC).
Results:
The Brazilian version demonstrated strong content validity (Content Validity Index = 0.90). Pre-testing indicated good comprehension following minor linguistic adjustments. CFA supported the three-factor model (trust, importance, recommendation), with excellent fit indices (CFI = 0.972; TLI = 0.962; RMSEA = 0.056; SRMR = 0.052). Internal consistency ranged from 0.70 to 0.89. Test-retest analysis showed moderate temporal stability (ICC = 0.74).
Conclusion:
The Brazilian VTG provides initial evidence of validity and reliability for assessing vaccine trust among adolescents. The instrument may support monitoring of vaccine trust, inform targeted interventions, and guide public health strategies across diverse immunization contexts.
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