Table 3.

Assignment of each factor

Variable	Assignment
Age	Enter the actual value
Pre-pregnancy BMI	Enter the actual value
Pregnancy BMI	Enter the actual value
Gestational age	Enter the actual value
Marital status	0= Unmarried, 1= Married
Educational background	0= Primary school, 1= Middle and high school, 2= College
Number of Pregnancies	0=1-2 times, 1=3-4 times, 2= > 4 times
Placenta previa	0= no, 1= yes
Placenta previa	0= no, 1= yes
HDP	0= no, 1= yes
GDM	0= no, 1= yes
Uterine fibroids	0= no, 1= yes
Fetal macrosomia	0= no, 1= yes
Uterine atony	0= no, 1= yes
Scarred uterus	0= no, 1= yes
Assisted reproduction	0= no, 1= yes

Note: BMI, body mass index; HDP, hypertensive disorder of pregnancy; GDM, gestational diabetes mellitus.