Table 4 Analysis results on influencing factors of fetal loss by multivariate conditional logistic regression model

 Junior high school and below

5.13

2.19–12.02

 Senior high school

4.91

2.09–11.54

 Undergraduate course

1.93

0.94–3.94

Residence in a rural area

2.85

1.92–4.25

Unemployment

1.81

1.20–2.71

Spontaneous abortion history

1.88

1.26–2.80

Preterm birth history

11.08

2.90–42.26

Hypertensive disorders of pregnancy

7.20

2.24–23.12

Preterm premature rupture of membranes

4.12

1.53–11.11

Velamentous cord insertion

4.61

0.99–21.44

In vitro fertilization and embryo transfer

1.78

0.89–3.54