Skip to main content

Table 1 Maternal and obstetric characteristics according to umbilical artery Doppler studies

From: Significance of abnormal umbilical artery Doppler studies in normally grown fetuses

CharacteristicsTotal
N = 2744
No (%) in groupP value
Normal UADS
N = 2646
Abnormal UADS
N = 98
Maternal age, mean (standard deviation)28.8 (6.6)28.7 (6.6)29.7 (6.7)NS *
Race (%)   <  0.05 §
 White904881 (33.3)23 (23.5) 
 African-American14221356 (51.3)66 (67.4) 
 Hispanic7069 (2.6)1 (1.0) 
 Asian231226 (8.5)5 (5.1) 
 Other117114 (4.3)3 (.3.1) 
 17 missing    
Parity (%)   NS §
 Nulliparous12461202 (45.4)44 (44.9) 
 Primiparas839813 (30.7)26 (26.5) 
 Parity = 2344327 (12.4)17 (17.4) 
 Parity = 3181174 (6.6)7 (7.1) 
 Parity > 3134130 (4.9)4 (4.1) 
Hypertension (%)   <  0.001 §
 None23042234 (84.4)70 (71.4) 
 Chronic186175 (6.6)11 (11.2) 
 Gestational103100 (3.8)3 (3.1) 
 Superimposed4237 (1.4)5 (5.1) 
 Preeclampsia109100 (3.8)9 (9.2) 
Diabetes (%)   NS §
 None23212244 (84.8)77 (78.6) 
 Chronic138129 (4.9)9 (9.2) 
 Gestational285273 (10.3)12 (12.2) 
 Gestational age at delivery, median (IQR)39.1 (38–40)39.1 (38.1–40)38.6 (37.3–39.7)<  0.001 ¶
Fetal gender (%)   NS §
 Male14091361 (51.4)48 (49) 
 Female13351285 (48.6)50 (51) 
Low-lying placenta (%)   NS §
 No26492556 (96.6)93 (94.9) 
 Yes9590 (3.4)5 (5.1) 
Placenta previa (%)   <  0.05 §
 No27302634 (99.6)96 (98.0) 
 Yes1412 (0.4)2 (2.0) 
PPROM (%)   NS §
 No26692574 (97.3)95 (96.9) 
 Yes7572 (2.7)3 (3.1) 
Smoker (%)   NS §
 No25782489 (94.1)89 (90.8) 
 Yes166157 (5.9)9 (9.2) 
Delivery mode (%)   NS §
 Vaginal Delivery15011454 (55.0)47 (48.0) 
 Operative251241 (9.1)10 (10.2) 
 Primary CS601575 (21.7)26 (26.5) 
 Repeated CS391376 (14.2)15 (15.3) 
Pre-pregnancy BMI (%)   NS §
 Underweight135130 (4.9)5 (5.1) 
 Normal11931151 (43.5)42 (42.9) 
 Overweight547533 (20.1)14 (14.3) 
 Obese869832 (31.4)37 (37.8) 
 138 missing    
  1. UADS Umbilical artery Doppler study, IQR Interquartile range, NS Not significant
  2. * Two-sample T-test used; § Chi-square test used; ¶ Mann-Whitney U test used