Statistical analysis
Statistical analyses were performed using SPSS 18.0 for Windows (SPSS Inc., Chicago, IL, USA). Data are presented as the mean ± standard deviation, number, or percentage. Data are presented as the mean ± standard deviation. Student’s t test was used to compare continuous variables (age, height, weight, BMI, EBV, TBL, Hbloss, VBL, IBL, post-operative drainage, PBL, HBL, and HBL as a % of true TBL). Multiple linear regression analysis was performed to identify risk factors involved in the HBL including six qualitative variables (volume of the largest removed leiomyoma, number of removed leiomyomas, types of largest removed leiomyoma in the uterus, cell types of largest removed leiomyoma in the uterus, degeneration of largest removed leiomyoma in uterus and location of largest removed leiomyoma in the uterus) and seven quantitative variables (age, BMI, surgical time, intro-operative blood loss, the use of pituitrin, pre-operative value of Hb and pre-operative value of Hct ). Statistical significance was set prior to data collection at p < 0.05.