3.1 Clinical characteristics of PE and control groups.
By comparatively screening the clinical data of pregnancy women (such as
BMI index, age, number of pregnancy and abortion, etc.), we enrolled
1138 cases as case group and 1342 cases as control group . There is no
statistical difference in the above characteristics between the two
groups (P > 0.05). However, the systolic and diastolic
blood pressure were higher in the
case group than in the control group, and the difference was
statistically significant (P <0.05); The admission pregnancy
week, gestation week to terminate pregnancy and fetal birth weight were
significantly lower in the case group than in the control group (P
<0.05). See Table 1.