The statistical analysis was performed using Minitab 17.1.0.0 for Windows (Minitab Inc., 2013, State College, PA, USA). Continuous data were presented as mean and standard deviation (SD) and categorical data as number and percentage (%); the normality of data was examined using the Shapiro–Wilk test. The associations between poor SQ and participant characteristics or COVID-19-related risks were evaluated using the Chi-square test and an independent t-test. The poor SQ prediction was evaluated using multiple regression analysis models, with either the adjusted or nonadjusted technique and backward elimination methods. All tests were two sided; P was considered significant if < 0.05.

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