Table 1 Baseline characteristics of ten studies included in the meta-analysis
Study | Year | Study design | Treatment regimen | NO.of patients | Age(mean ± SD, years) | Pregnancy duration(mean ± SD, days) | CS interval(mean ± SD, years) | Gravidity(n) | NO. of previous cesarean section |
|---|---|---|---|---|---|---|---|---|---|
Dong et al | 2018 | Case–control | USG-LLI + curettage | 78 | 35.87 ± 4.29 | 61.23 ± 12.3 | NR | 3.03 ± 0.78 | NR |
|  |  |  | UAE + curettage | 68 | 36.12 ± 4.2 | 60.89 ± 12.63 | NR | 2.98 ± 0.82 | NR |
Hong et al | 2022 | Case–control | USG-LLI + suction aspiration | 90 | 34.4 ± 5 | 46.2 ± 7.1 | 6 ± 3.4 | NR | 1.26 ± 0.75 |
|  |  |  | UAE + suction aspiration | 160 | 33.1 ± 4.8 | 51.1 ± 12.3 | 5.7 ± 3.8 | NR | 1.14 ± 0.5 |
Qian et al | 2020.02 | Case–control | USG-LLI + curettage | 61 | 33.47 ± 4.2 | 60.22 ± 13.78 | NR | 2.89 ± 0.92 | 1.33 ± 0.46 |
|  |  |  | UAE + curettage | 70 | 32.56 ± 3.95 | 59.38 ± 14.32 | NR | 3.17 ± 0.59 | 1.12 ± 0.55 |
Qian et al | 2020.07 | Case–control | USG-LLI + curettage | 30 | 33.56 ± 4.88 | 49.43 ± 12.07 | NR | NR | 1.37 ± 0.49 |
|  |  |  | UAE + curettage | 30 | 33.06 ± 4.88 | 50.1 ± 10.13 | NR | NR | 1.37 ± 0.49 |
Wu et al | 2020 | Case–control | USG-LLI + curettage | 86 | 33.17 ± 3.53 | 48.51 ± 12.84 | 5.82 ± 2.97 | NR | 1.57 ± 0.6 |
|  |  |  | UAE + curettage | 65 | 34 ± 3.81 | 50.48 ± 9.12 | 4.96 ± 3.3 | NR | 1.63 ± 0.49 |
Xu et al | 2020 | RCT | USG-LLI + vacuum curettage | 85 | 33.17 ± 3.53 | 60.27 ± 11.06 | 4.36 ± 1.84 | 2.76 ± 0.71 | NR |
|  |  |  | UAE + vacuum curettage | 85 | 36.87 ± 1.08 | 58.59 ± 11.83 | 4.52 ± 1.92 | 2.82 ± 0.74 | NR |
Zhang et al | 2020 | Case–control | USG-LLI + curettage | 86 | 32.1 ± 5.7 | 48.3 ± 12.1 | NR | 3.1 ± 1.8 | NR |
|  |  |  | UAE + curettage | 39 | 32.9 ± 4.6 | 48.7 ± 10 | NR | 3.3 ± 1.5 | NR |
Zhang et al | 2021 | Case–control | USG-LLI + curettage | 17 | 34.76 ± 5.99 | 61.88 ± 30.5 | 5.16 ± 2.5 | NR | NR |
|  |  |  | UAE + curettage | 17 | 32.17 ± 2.29 | 52 ± 34.28 | 4 ± 2.5 | NR | NR |
Zhu et al | 2021 | RCT | USG-LLI + curettage | 18 | 3.86 ± 18 | 47.28 ± 15.7 | 6.56 ± 3.37 | 3.5 ± 3 | 1.32 ± 0.25 |
|  |  |  | UAE + curettage | 21 | 32.86 ± 4.91 | 52.57 ± 9.21 | 5.76 ± 3.78 | 3 ± 1.5 | 1.44 ± 0.5 |
Zhu et al | 2022 | Case–control | USG-LLI + curettage | 72 | 32.28 ± 4.88 | 45 ± 8.15 | 4.5 ± 4.2 | 4 ± 0.5 | 1.3 ± 0.5 |
|  |  |  | UAE + curettage | 72 | 33.04 ± 4.22 | 46 ± 8.89 | 6 ± 4.44 | 4 ± 0.5 | 1.43 ± 0.5 |