Several independent variables were examined in the study, including sociodemographic characteristics such as age (1524, 2534, 3544, or 45 years), sex (male or female), marital status (not married or married), education (no formal education, middle school and lower, high school or equivalent degree, or college or higher), employment status (government, private, self-employed, student, housewife, or unemployed), and residency (rural or urban)
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