Table 1.

Clinical and obstetrical characteristics of the study population (n=720)

Mean maternal age ± SD, years	25.4 ± 6.6
Maternal age, n (%)
Younger than 18	59 (8.2)
18–24	309 (42.9)
25–34	268 (37.2)
35 and over	84 (11.7)
Mean gestational age at entry ±SD, weeks	8.8 ± 2.4
Gestational age at first prenatal visit, n (%)
< 9 weeks	396 (55.0)
9 to <11 weeks	166 (23.1)
11 to ≤14 weeks	158 (21.9)
History of previous pregnancies, n (%)
Nulliparous	381 (52.9)
Parity 1	204 (28.3)
Parity ≥ 2	135 (18.8)
Smokers, n (%)	89 (12.4)
Mean BMI ± SD kg/m2	26.3 ± 5.1
BMI range	16.3 – 45.8
Initial weight, n (%)
Underweight (BMI<20)	56 (7.8)
Normal weight (BMI:20–24.9)	299 (41.5)
Overweight (BMI:25–29.9)	220 (30.6)
Obesity (BMI≥30)	145 (20.1)