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

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

Characteristics

Total

N = 2744

No (%) in group

P 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 §

 White

904

881 (33.3)

23 (23.5)

 

 African-American

1422

1356 (51.3)

66 (67.4)

 

 Hispanic

70

69 (2.6)

1 (1.0)

 

 Asian

231

226 (8.5)

5 (5.1)

 

 Other

117

114 (4.3)

3 (.3.1)

 

 17 missing

    

Parity (%)

   

NS §

 Nulliparous

1246

1202 (45.4)

44 (44.9)

 

 Primiparas

839

813 (30.7)

26 (26.5)

 

 Parity = 2

344

327 (12.4)

17 (17.4)

 

 Parity = 3

181

174 (6.6)

7 (7.1)

 

 Parity > 3

134

130 (4.9)

4 (4.1)

 

Hypertension (%)

   

<  0.001 §

 None

2304

2234 (84.4)

70 (71.4)

 

 Chronic

186

175 (6.6)

11 (11.2)

 

 Gestational

103

100 (3.8)

3 (3.1)

 

 Superimposed

42

37 (1.4)

5 (5.1)

 

 Preeclampsia

109

100 (3.8)

9 (9.2)

 

Diabetes (%)

   

NS §

 None

2321

2244 (84.8)

77 (78.6)

 

 Chronic

138

129 (4.9)

9 (9.2)

 

 Gestational

285

273 (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 §

 Male

1409

1361 (51.4)

48 (49)

 

 Female

1335

1285 (48.6)

50 (51)

 

Low-lying placenta (%)

   

NS §

 No

2649

2556 (96.6)

93 (94.9)

 

 Yes

95

90 (3.4)

5 (5.1)

 

Placenta previa (%)

   

<  0.05 §

 No

2730

2634 (99.6)

96 (98.0)

 

 Yes

14

12 (0.4)

2 (2.0)

 

PPROM (%)

   

NS §

 No

2669

2574 (97.3)

95 (96.9)

 

 Yes

75

72 (2.7)

3 (3.1)

 

Smoker (%)

   

NS §

 No

2578

2489 (94.1)

89 (90.8)

 

 Yes

166

157 (5.9)

9 (9.2)

 

Delivery mode (%)

   

NS §

 Vaginal Delivery

1501

1454 (55.0)

47 (48.0)

 

 Operative

251

241 (9.1)

10 (10.2)

 

 Primary CS

601

575 (21.7)

26 (26.5)

 

 Repeated CS

391

376 (14.2)

15 (15.3)

 

Pre-pregnancy BMI (%)

   

NS §

 Underweight

135

130 (4.9)

5 (5.1)

 

 Normal

1193

1151 (43.5)

42 (42.9)

 

 Overweight

547

533 (20.1)

14 (14.3)

 

 Obese

869

832 (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