Table 1 Baseline characteristics of the patients

Age (years)

24.88 ± 6.61

Clinical manifestation

 Intermenstrual bleeding

19

 Increased menstrual volume/prolonged menstrual period

7

 Irregular vaginal bleeding

6

Preoperative hemoglobin (g/l)

111.63 (60.00,144.00)

 Mild anemia

7

 Moderate anemia

6

Abnormal intrauterine echo size (cm²)

0.4 × 0.5–1.4 ×   2.1