Consistency and reliability of the Brazilian Portuguese version of the Mini-Sleep Questionnaire in undergraduate students.
OBJECTIVE
Questionnaires are indispensable tools in epidemiologic studies and clinical surveys. Many questionnaires focusing on sleep disorders have been described in the literature. This cross-sectional study is aimed to assess the consistency and reliability of the Brazilian Portuguese Version of the Mini-Sleep Questionnaire (MSQ-BR).


METHODS
Self-administered questionnaires were given to a sample of 1,108 undergraduate students. The variables collected were age, gender, socioeconomic level, and MSQ-BR scores. A subgroup of 53 students was randomly chosen to test the test-retest reliability of the instrument. Internal consistency of total MSQ-BR and its subscales (i.e., insomnia and hypersomnia) was evaluated using Cronbach's alpha coefficient.


RESULTS
Our results showed good internal consistency of total MSQ-BR score, with a Cronbach's alpha value of 0.770. The insomnia subscale had an adequate internal consistency (Cronbach's alpha, 0.749). On the other hand, the hypersomnia subscale had moderate internal consistency (Cronbach's alpha, 0.624). The test-retest analysis showed good reliability of the instrument using Pearson's correlation coefficient.


CONCLUSIONS
The MSQ-BR has adequate internal consistency and test-retest reliability. The MSQ-BR insomnia has adequate internal consistency for use as a separate application. However, the MSQ-BR hypersomnia demonstrated only moderate internal consistency for use as a separate application. Our intention was not to introduce modifications to the questionnaire, but to evaluate the reliability of total MSQ-BR and its subscales. Others studies are needed to assess the consistency of MSQ compared to other instruments.
Falavigna
Asdrubal
A
University of Caxias do Sul, Rua General Arcy da Rocha Nóbrega, Caxias do Sul, RS, Brazil. asdrubalmd@gmail.com
de Souza Bezerra
Márcio Luciano
ML
Teles
Alisson Roberto
AR
Kleber
Fabrício Diniz
FD
Velho
Maíra Cristina
MC
da Silva
Roberta Castilhos
RC
Mazzochin
Thaís
T
Santin
Juliana Tosetto
JT
Mosena
Gabriela
G
de Braga
Gustavo Lisboa
GL
Petry
Francine Lopes
FL
de Lessa Medina
Miguel Francisco
MF
D000328:Adult; D001938:Brazil; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000706:statistics & numerical data; D012016:Reference Values; D015203:Reproducibility of Results; D012891:Sleep Apnea Syndromes / Q000175:diagnosis* / Q000453:epidemiology; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis* / Q000453:epidemiology; D013334:Students; D011795:Surveys and Questionnaires; D014175:Translating; D055815:Young Adult