Statistical analysis
The chi-square test and Student’s t-test were used for comparison of
categorical and continuous variables, respectively. Levene’s test was
used to check the homogeneity of variance; equivalent non-parametric
tests were used when Kolmogorov–Smirnov was in favour of the absence of
normal distribution. Results with P < 0.05 were
regarded as significant. PASW Statistics version 18.0 was used for
descriptive and inferential statistical analysis.