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Adolescent and young adult ages and pregnancy characteristics.
| Mean | Standard deviation | Range | |
|---|---|---|---|
| Maternal age (years) | 18.3 | 2.1 | 14–22 |
| Gestational age at visit (weeks) | 18.1 | 7.3 | 5–40 |
| Gestational age at birth (weeks) | 38.6 | 2.3 | 23–42 |
| Birth weight (grams) | 3080 | 577 | 440–4600 |
