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| Variable | n |
| Age (years) | |
| 20–23 | 5 |
| 25–31 | 2 |
| Gestational age (weeks) | |
| 32.0–35.6 | 3 |
| 36.0–38.0 | 4 |
| Relationship status | |
| Married | 2 |
| Partnered (boyfriend) | 5 |
| Race/ethnicity | |
| African American | 3 |
| Hispanic | 2 |
| Jamaican | 1 |
| Turkish | 1 |
| Education | |
| Less than high school | 1 |
| High school graduate or equivalent | 2 |
| Some college | 4 |
