Figure 2: Comparison on preoperative β-HCG level and sonographic features among the five groups. The values show the means ± standard deviation. *,†,‡Indicate that the value for the difference between the two groups compared is P < 0.05, P < 0.01, and P < 0.001, respectively. Only differences with statistical significance are indicated. β-HCG: Beta-human chorionic gonadotropin; UACE: Uterine artery chemoembolization; D&C: Dilation and curettage; GS: Gestational sac.