Table 1.
Distribution of maternal characteristics in the study categories.
| Mid-trimester (n = 65) |
Term not in labor (n = 22) |
Term in labor (n = 47) |
Preterm labor (n = 209) |
|
|---|---|---|---|---|
| Maternal age (years) | 37 (35–38) | 28.5 (21.8–32) | 23 (20–28) | 23.9 (20–27) |
| Gravity | 3 (2–3) | 3 (2–4) | 2 (1–3.3) | 3 (2–4) |
| Gestational age at amniocentesis (weeks) | 16 (16–17) | 39.3 (38.4–40) | 39 (38–40) | 28.5 (24.7–32.4) |
| Amniotic fluid sample storage time (years) | 11.7 (10.9–12.2) | 16.6 (16.5–16.6) | 16.6 (16.6–16.7) | 5.2 (4.7–6.1) |
| Gestational age at delivery (weeks) | 39 (38–40) | 39.3 (38.4–40) | 39 (38–40) | 33.1 (28.7–37.7) |
| Birth weight (grams) | 3345 (3144–3632) | 3405 (3130–3688) | 3220 (3090–3680) | 2044 (1110–2760) |
Values are expressed as median (interquartile range).