Figure legend
Figure 1:The flowchart of participant enrollment. 780 women with history of HA-treated IUAs before this pregnancy were compared with 3010 women with no history of IUAs matched on propensity score, maternal age and parity, mode of conception, pre-pregnancy BMI and prior history of abortion.
Figure 2:Associations between the number of hysteroscopic surgeries and the risk of adverse obstetric outcomes. Relative risks (RRs) of PE (Figure 2A), placenta previa (Figure 2B), placenta accreta spectrum (Figure 2C), PPH (Figure 2D), hemostatic therapies (Figure 2E), cervical cerclage (Figure 2F), PPROM (Figure 2G) and iatrogenic preterm birth (Figure 2H) associated with the number of hysteroscopic surgeries. All P for trend < 0.01.