Reliability and validity of the Chinese version of Global Sleep Assessment Questionnaire in adult patients with sleep disorders.

OBJECTIVE

This study aimed to translate Global Sleep Assessment Questionnaire (GSAQ) in Chinese and to validate it in adult patients with sleep disorders.

METHODS

GSAQ was translated following the steps of scale translation. Two hundred and one adult patients (aged over 18 years old) with sleep disorders were recruited. All filled out the 11-item Chinese version of GSAQ. The translated version was tested by exploratory factor analysis (EFA), confirmatory factor analysis (CFA), criterion validity, Cronbach's α and spilt-half reliability. To evaluate the predictive ability of the questionnaire and elicit cutoff values, receiver operating characteristic (ROC) curves were generated.

RESULTS

Out of the 11 questions in the questionnaire, each item was significantly correlated with the total score by a correlation coefficient (r) ranging from 0.24 to 0.73. Four factors were extracted explained 68.89% of the total variance. Cronbach's α coefficient for the total scale of 11 items was 0.72 and for four factors was 0.81, 0.64, 0.76 and 0.72 respectively, with a split-half reliability of 0.75. ROC analysis yielded an AUC > 0.8. The "obstructive sleep apnea related", "insomnia related", "restless legs syndrome related", and "parasomnias related" scores showed cutoff values of 3,3,1,1, respectively. The GSAQ had positive correlation with AHI (r = 0.248 p = 0.0025), insomnia severity index (r = 0.322, p = 0.017) and the rapid eye movement sleep behavior disorder screening questionnaire (r = 0.721, p < 0.0001). There was no correlation between the total GSAQ score and iRLS (r = 0.140, p = 0.309).

CONCLUSION

The Chinese version of the GSAQ is available and can be used to evaluate the sleep disorders of adult patients.