# Psychometric evaluation of the Brazilian-Portuguese version of the Functional Outcome of Sleep Questionnaire 10 (FOSQ-10) in patients with obstructive apnea

## TL;DR

The Brazilian-Portuguese version of the FOSQ-10 is a valid and reliable tool for assessing sleep-related outcomes in patients with obstructive sleep apnea.

## Contribution

The paper provides a validated and reliable Brazilian-Portuguese version of the FOSQ-10 questionnaire for obstructive sleep apnea patients.

## Key findings

- The FOSQ-10P showed satisfactory psychometric properties including high reliability and validity.
- FOSQ-10P scores correlated significantly with the Epworth Sleepiness Scale.
- Missing data were non-random and linked to specific questions.

## Abstract

•The translation and cultural adaptation of the FOSQ-10 into Portuguese is valid and reliable.•The study methodology was grounded in the APA & NCME, 2014 guidelines proposed by the AERA.•The missing values are non-random, associated with individuals not performing tasks (questions 3, 4, and 10).•The total scores of FOSQ-10P exhibited a significant negative correlation with the total scores of the ESE.

The translation and cultural adaptation of the FOSQ-10 into Portuguese is valid and reliable.

The study methodology was grounded in the APA & NCME, 2014 guidelines proposed by the AERA.

The missing values are non-random, associated with individuals not performing tasks (questions 3, 4, and 10).

The total scores of FOSQ-10P exhibited a significant negative correlation with the total scores of the ESE.

Perform the validation and psychometric evaluation of the Brazilian-Portuguese translation of the Functional Outcome of Sleep Questionnaire 10 (FOSQ10).

182 patients (65 females 48.3 ± 14.4 years and 117 males 46.9 ± 12.4 years), were evaluated by sleep physicians suspected of having Obstructive Sleep Apnea, underwent polysomnography and completed the FOSQ-10 and the Epworth Sleepiness Scale. APA & NCME, 2014 was used to validate the data as the American Educational Research Association recommended.

Quality indicators such as Bartlett's test of sphericity (χ2 = 1108.2; gL = 45; p =  0.000010) and KMO (0.83), and adherence measures, attest to the quality of the model. The indicators TLI (0.97), CFI (0.98), and RMSEA (0.04) fall within the expected values. Using the Eigenvalue > 1 technique, two factors explain 53% and 13.3% of the variances. In the Parallel Analysis technique, a single factor explained 59.4653% of the random variance, and the Unidimensionality indicators UniCo = 0.921, ECV = 0.822, and MIREAL = 0.253, were supported. Construct Validity: reliability coefficients Cronbach’s α = 0.87, McDonald’s ordinal Omega index 0.9, and the Composite Reliability 0.891 were satisfactory.

There was a significant Spearman correlation between FOSQ-10 and the Epworth Sleepiness Scale (r = 0.364 [−0.487; −0.226]).

Was not possible to differentiate the groups based on the severity of AHI using FOSQ-10P.

The Brazilian translation of FOSQ-10 is valid and reliable for identifying significant effects of excessive daytime sleepiness in patients with Obstructive Sleep Apnea.

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