The respondents, who were female (PR = 1.5, 95% CI 1.2 - 1.8, p <0.001), had higher per capita income for 12 months (PR = 0.98, 95% CI 0.97 - 0.99, p=0.029) or chronic disease (PR = 1.3, 95% CI 1.1 - 1.6, p <0.041), had significantly related with self-medication.