The PSQI was submitted to Cronbach's alpha and the result was 0.79, higher than 0.70, which indicates the items high internal consistency and homogeneity.
El PSQI fue sometido a la prueba alfa de Cronbach, siendo el resultado 0,79 superior a 0,70, indicando elevada consistencia interna y homogeneidad de los ítems.
O PSQI foi submetido ao teste alfa de Cronbach, sendo o resultado 0,79 superior a 0,70, indicando elevada consistência interna e homogeneidade dos itens.