Data analysis
Statistical analysis was performed using SPSS, version 21.0 software (IBM Corp., Armonk, NY). Continuous variables were compared with Mann-Whitney U-test. Chi-square or Fisher’s exact test was used for categorical data, as appropriate. Demographics and medical data were compared between the study and control group using univariate analysis. Potential confounders and significant variables in the univariate analysis were entered into multivariable binary regression analysis to establish their effect on the risk for uterine rupture. A probability value <0.05 was considered significant.