Statistical analyses
Data were systematically transferred from medical records
to Microsoft Excel 2010. Statistical analyses were
performed using SAS 9.2 for Windows. Data frequencies
(in percentage) were compared using the chi-square test;
means were evaluated by analysis of variance (ANOVA),
followed by the Tukey-Kramer test for multiple comparisons.
Data on maternal, neonatal and delivery outcomes
were assessed using logistic regression to calculate odds
ratios with confidence intervals (CI 95 %). Significance
level was set at p < 0.05.