Cough Severity Index: Validation in Brazilian Portuguese
Vanessa Veis Ribeiro1, Leonardo Wanderley Lopes2, Allan Carlos França da Silva2
1Speech-Language Pathology Department, Universidade Federal de São Paulo - UNIFESP. São Paulo, Brazil; Speech-Language Pathology Department, Universidade Federal de Sergipe - UFS. Lagarto, Sergipe, Brazil.
Objective:
To develop a validity profile for the cough severity index in the Brazilian Portuguese language (CSI-Br).
Methods:
The study sample consisted of 100 participants divided into Chronic Cough Group (CG; 50 individuals with a mean age of 46.4; standard deviation [SD]: 11.7) and Healthy Control Group (HCG; 50 individuals with a mean age of 33.0 [SD: 12.3]). The data collection procedures were as follows: (a) application of CSI-Br for all participants; (b) application of the Voice Handicap Index (VHI)-10 and the Newcastle Laryngeal Hypersensitivity Questionnaire (LHQ-Br) in the CG; (c) application of CSI-Br for test-retest reliability with an interim of between 2-14 days. The CSI-Br validation was composed of five stages: construct validity, reliability, reproducibility, convergent validity, and discriminant validity.
Results:
In construct validity, the instrument identified two factors and explained 67.6% of the total variance. The reliability had a value of a=0.914. Reproducibility showed an ICC value of 0.909. CSI-Br showed a negative correlation with VHI-10 and a positive correlation with LHQ-Br in convergent validity. In discriminant validity, all items and factors differentiated participants in the CG from those in the HCG.
Conclusion:
The ten-item CSI-Br with two factors is reliable and valid for analyzing the severity of chronic cough symptoms in Brazilian individuals.
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