Notes. For education: P=primary education or less and S=secondary education or higher. Chi-square (χ2) test was used to test whether there is relationship between the level of education and the different categorical variables in the table; values in parenthesis are degrees of freedom; and ⁎⁎⁎pb0.000, ⁎⁎pb0.01, ⁎pb0.05 and n.s.=not significant. The probability of the Fisher's exact test was used when the assumptions of the chi-square test was not met.