TABLE 1.

Characteristics of the study population.

Group	Healthy pregnancy (n = 30) (preterm birth)	Preeclampsia with severe features (n = 30)
Gestational age, y	31.8 ± 4.4	31.45 ± 5.6
Early pregnancy body mass index, kg/m2	24.3 ± 2.2	22.5 ± 3.3
Gestation of sampling, day	237.0 ± 17.2	242.3 ± 19.3
Gestation of delivery, day	240.2 ± 17.1	245.6 ± 16.3
Systolic blood pressure, mm Hg	113.6 ± 9.7	172.0 ± 10.4**
Diastolic blood pressure, mm Hg	73.4 ± 9.3	103.2 ± 10.7**
24-h urinary protein, g	/	4.9 ± 1.8 30 (100%)
Thrombocytopenia	1 (3.3%)	9 (30.0%)**
Impaired liver function	/	17 (56.7%)
Progressive renal insufficiency	/	15 (50.0%)
Pulmonary edema	/	6 (20.0%)
New-onset cerebral or visual disturbances	/	2 (6.7%)
Birth weight, g	1966.8 ± 528.8	2164.0 ± 886.0
Birth length, cm	47.8 ± 2.8	45.3 ± 4.5
Fetal growth restriction rate	36.8%	33.2%

Thrombocytopenia: platelet count less than 100,000/microliter; impaired liver function: abnormally elevated blood concentrations of liver enzymes (to twice normal concentration), severe persistent right upper quadrant or epigastric pain unresponsive to medication and not accounted for by alternative diagnoses, or both; progressive renal insufficiency: serum creatinine concentration greater than 1.1 mg/dL or a doubling of the serum creatinine concentration in the absence of other renal disease. The results are presented as the mean ± SD.

** Represents pregnant women with preeclampsia and severe features (sPE) or pre-term pregnancy group compared with term pregnancy group, ** P < 0.01.