Brief Spanish Zung Self-Rating Anxiety Scale: Dimensionality, Internal Consistency, Nomological Validity, and Differential Item Functioning Among Chronic Obstructive Pulmonary Disease Patients in Colombia

Background and purposes: The brief Spanish Zung Self-Rating Anxiety Scale is a ten-item tool available; however, there is little information about its psychometric performance. The study aimed to test the dimensionality, internal consistency, nomological validity, and gender differential item functioning of the scale in patients with chronic obstructive pulmonary disease (COPD) in Colombia. Methods: A psychometric study was designed. It participated in 408 COPD patients aged between 40 and 102 years. Results: The confirmatory factor analysis showed both one- and two-dimension structures with acceptable goodness-of-fit indicators. The brief Spanish Zung Self-Rating Anxiety Scale presented high internal consistency, acceptable nomological validity, and non-gender differential functioning. Conclusions: The brief Spanish Zung Self-Rating Anxiety Scale presents some good indicators of validity and reliability, and it can be used in the measurement of anxiety in COPD patients.