Table 1 The baseline clinical characteristics of 40 patients ^a

Age (yr)

32.88 ± 4.55 (24–43)

Interval from last cesarean section to surgical treatment (month)

68.61±45.34 (9–188)

Gestational age (day)

58.59 ± 16.48 (41–120)

Serum β-hCG level (IU/L)

47,379.73 ± 45,285.10 (9.2–188,942)

Diameter of gestational sac (mass) on ultrasound scan (mm)

33.78 ± 13.14 (12–60)