Psychometric Properties and Measurement Invariance Across Gender and Age‑Group of the Perseverative Thinking Questionnaire–Children (PTQ‑C) in Colombia

Translation and validation of the PTQ-C in 1,127 Colombian children and adolescents (8–18 years). All items showed good discrimination; internal consistency was excellent (α = .93). Analyses confirmed a unidimensional structure and invariance by sex and age group. The PTQ-C was strongly associated with measures of pathological worry and emotional symptoms; it is valid and reliable for measuring RNT in child populations.