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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