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Table 10 Level of significance for sex differences in umbilical artery Doppler indices and fetal heart rate

From: Sex differences in umbilical artery Doppler indices: a longitudinal study

Gestation (week)

UA PIa

UA RIa

UA S/D ratioa

Fetal HR

P value

P value

P value

P value

20

0.00795

0.00282

0.00213

0.58551

21

0.00695

0.00219

0.00171

0.44020

22

0.00621

0.00172

0.00139

0.30634

23

0.00573

0.00139

0.00117

0.19662

24

0.00552

0.00117

0.00103

0.11804

25

0.00564

0.00104

0.00097

0.06888

26

0.00616

0.00102

0.00100

0.04136

27

0.00724

0.00109

0.00113

0.02704

28

0.00915

0.00132

0.00141

0.01991

29

0.01234

0.00178

0.00196

0.01656

30

0.01748

0.00264

0.00295

0.01526

31

0.02550

0.00421

0.00473

0.01518

32

0.03755

0.00699

0.00784

0.01586

33

0.05486

0.01172

0.01309

0.01706

34

0.07849

0.01939

0.02150

0.01864

35

0.10911

0.03110

0.03424

0.02049

36

0.14679

0.04786

0.05239

0.02253

37

0.19098

0.07041

0.07670

0.02470

38

0.24064

0.09901

0.10746

0.02696

39

0.29443

0.13342

0.14444

0.02926

40

0.35092

0.17300

0.18692

0.03159

Overallb

0.07560

0.01850

0.01980

0.02560

  1. The results for the gestational age-specific sex differences in mean values for fetal heart rate (HR) and for the adjusted umbilical artery (UA) Doppler indices, organized by gestational week
  2. UA umbilical artery, PI pulsatility index, RI resistance index, S/D ratio systolic/diastolic ratio, HR heart rate
  3. aAdjusted for fetal heart rate
  4. bOverall level of significance for sex differences during 20–40 weeks of gestation