Results
A total of 999 patients (mean age, 28.7±4.3years) with CHD were collected, including 403 cases (40.0%) in the surgical group and 596 cases (60.0%) in the non-surgical group. The most common CHD was atrial septal defect(ASD, 33.1%), followed by ventricular septal defect (VSD, 26.9%), patent ductus arteriosus (PDA, 9.9%) and tetralogy of Fallot (TOF) (Figure 2 ). The classification of various CHD are shown in Supplementary Table 1 .
The overall percentage of patients who didn’t get surgery (60.0%) had a higher percentage than those who got surgery(40.0%). And there was a higher rate of surgery for complex CHD, such as TOF (89.9%), a lower rate of surgery for simple CHD, such as patent foramen ovale (PFO, 0.0%). For each type of CHD, the rate of surgical versus non-surgical is shown in Figure 3 and Supplementary Table 1 .
We collected sociodemographic information of these women, region, education degree, gravidity and parity, which were summarized in theTable 1 . There was no statistically significant difference in age, mean pregnant weeks and parity between the two groups. P<0.05 in the comparison of region, education degree and gravidity.
In obstetric events, cardiovascular events, delivery procedure, fetal events and other events, the incidence of almost all events was higher in the surgical group. And there were significant differences in pre-term delivery, LBW, HF, CS, PH and death between the two groups (P<0.05). More details are shown in Table 2 .
A total of 16 patients (1.6%) died in the two groups, including 2 patients in the surgical group and 14 patients in the non-surgical group. More details are shown in Table 3. And there were 8 newborns (0.8%) died in the hospital.