Maternal characteristics during the study period, before and after Oct 6^th 2008.

£<p>Missing values n = 396 were excluded from analysis.</p>¥<p>Missing values n = 116 were excluded from analysis.</p>β<p>Missing values n = 229 were excluded from analysis.</p>*<p><i>p</i>-values are based on Chi-square test, except for maternal age where independent sample t-test was used.</p>**<p>Difference is statistically significant within p = 0.05.</p>***<p>Difference is statistically significant equal to or within p = 0.001.