Statistical analyses were performed using SPSS version 18.0 (SPSS Inc, Chicago, IL, USA). Continuous variables are presented as mean ±SD. An independent t test was used to evaluate the difference between the two groups. A Fisher exact test or χ2 testwas performed to compare categorical data. An ANOVA was used to evaluate the factors correlated with total blood loss. P b 0.05 was considered statistically significant.