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Table 1 Baseline characteristics of all pregnant women in this study

From: Serum urea acid and urea nitrogen levels are risk factors for maternal and fetal outcomes of pregnancy: a retrospective cohort study

Characteristics of maternal and neonatal
No. of maternal 1602
Age (years) 31.58 ± 3.82
Age categories
 < 35 1217 (76.0)
 ≥ 35 385 (24.0)
Pre-pregnancy BMI (kg/m2) 20.78 (3.31)
Education, n (%)
 Primary 54 (3.4)
 Secondary 228 (14.2)
 College or above 1320 (82.4)
Conception method
 Natural 1582 (98.8)
 Artificial 11 (0.7)
Number of pregnancies 2.23 ± 1.15
Parity, n (%)
 Primiparity 696 (43.4)
 Multiparity 906 (56.6)
 History of miscarriage, n (%) 682 (42.6)
Gestational age at delivery (weeks) 38.91 ± 1.19
UA (μmol/L)
 Second trimester 209.88 ± 43.57
 Third trimester 286.04 ± 64.00
UN (mmol/L)
 Second trimester 2.61 ± 0.63
 Third trimester 2.94 ± 0.73
Blood pressure (mmHg)
 SBP 117.10 ± 11.91
 DBP 66.62 ± 9.38
OGTT
 FPG (mmol/L) 4.60 ± 0.34
 1 h (mmol/L) 7.99 ± 1.63
 2 h (mmol/L) 6.98 ± 1.32
Birth weight (kg) 3322.55 ± 410.83
Adverse maternal and fetal outcomes, n (%)
 GDM 310 (19.4)
 Gestational hypertension 44 (2.7)
 PROM 313 (19.5)
 PTB 37 (2.3)
 LBW 29 (1.8)
 SGA 83 (5.2)
  1. Data was presented as mean (SD) for continuous variables and n (%) for categorical. BMI body mass index, UA urea acid, UN urea nitrogen, SBP systolic blood pressure, DBP diastolic blood pressure, OGTT oral glucose tolerance tests, FPG fasting plasma glucose, GDM gestational diabetes mellitus, PROM premature rupture of membranes, PTB premature birth, LBW low birth weight infants, SGA small for gestational age infants