Functional Polymorphisms of Matrix Metalloproteinases 1 and 9 Genes in Women with Spontaneous Preterm Birth

Table 1

Characteristics of women with SPTB and their newborn children.

Maternal characteristics^a
Maternal age at delivery (years)^b	30 [18–41]
Gestational age at delivery, (%)
Severe preterm <33 weeks	29 (26.9)
Moderate preterm 34–37 weeks	79 (73.1)
Smoking during pregnancy, (%)
Yes	11 (10.2)
No	97 (89.8)
PTB in mother and/or sibling(s), (%)
Yes	33 (30.6)
No	75 (69.4)
Parity, (%)
1	65 (60.2)
≥2	43 (39.8)
Newborn characteristics^c
Mean birth weight (grams)^b	2325 [260–3915]
Congenital anomalies,	0
Evidence of infection,	0

Available for 108 women with PTB.
Data is presented as mean and range in parenthesis.
Available for 108 newborn children of women with PTB.