Table 2.
Resultant variables for the analysis
| Risk factor | Type |
|---|---|
| Sociodemographic | |
| Age | Continuous |
| Maternal race | Categorical |
| Paternal race | Categorical |
| Maternal ethnicity | Categorical |
| Paternal ethnicity | Categorical |
| Education level | Categorical |
| Household income | Categorical |
| Employment status | Categorical |
| Insurance status | Categorical |
| Marital status | Categorical |
| BMI | Continuous |
| Clinical phenotype | |
| Infection/inflammation | Categorical |
| Decidual hemorrhage | Categorical |
| Cervical insufficiency | Categorical |
| Placental dysfunction | Categorical |
| Family history | Categorical |
| Maternal comorbidities | Categorical |
| Maternal stress | Categorical |
| Obstetric history | |
| Number of previous deliveries | Continuous |
| Number of previous abortions | Continuous |
| Time since the last pregnancy | Continuous |
| Previous birth weight | Continuous |
| Previous caesarean section | Categorical |
BMI: body mass index.