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Table 2 Umbilical artery pulsatility index (male)

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

Gestation (week)

2.5th percentile

5th percentile

10th percentile

25th percentile

Mean

75th percentile

90th percentile

95th percentile

97.5th percentile

20

0.90

0.95

1.01

1.11

1.23

1.35

1.48

1.55

1.62

21

0.88

0.92

0.98

1.08

1.20

1.33

1.45

1.52

1.59

22

0.85

0.90

0.96

1.06

1.18

1.30

1.42

1.49

1.56

23

0.83

0.88

0.93

1.03

1.15

1.27

1.39

1.47

1.53

24

0.81

0.86

0.91

1.01

1.13

1.25

1.37

1.44

1.51

25

0.79

0.83

0.89

0.98

1.10

1.22

1.34

1.42

1.48

26

0.76

0.81

0.86

0.96

1.08

1.20

1.32

1.39

1.46

27

0.74

0.79

0.84

0.94

1.05

1.17

1.29

1.37

1.43

28

0.72

0.76

0.82

0.91

1.03

1.15

1.27

1.34

1.41

29

0.69

0.74

0.79

0.89

1.00

1.13

1.25

1.32

1.39

30

0.67

0.72

0.77

0.87

0.98

1.10

1.22

1.30

1.36

31

0.65

0.70

0.75

0.84

0.96

1.08

1.20

1.28

1.34

32

0.63

0.67

0.73

0.82

0.94

1.06

1.18

1.25

1.32

33

0.61

0.65

0.70

0.80

0.91

1.04

1.16

1.23

1.30

34

0.58

0.63

0.68

0.78

0.89

1.02

1.14

1.21

1.28

35

0.56

0.61

0.66

0.76

0.87

1.00

1.12

1.19

1.26

36

0.54

0.59

0.64

0.73

0.85

0.98

1.10

1.17

1.24

37

0.52

0.57

0.62

0.71

0.83

0.96

1.08

1.16

1.23

38

0.50

0.54

0.60

0.69

0.81

0.94

1.06

1.14

1.21

39

0.48

0.52

0.58

0.67

0.79

0.92

1.04

1.12

1.19

40

0.46

0.50

0.56

0.65

0.77

0.90

1.02

1.10

1.17

  1. Sex-specific reference values of the umbilical artery pulsatility index (UA PI) for the 2.5th, 5th, 10th, 25th, 50th, 75th, 90th, 95th, and 97.5th percentiles during the second half of pregnancy (male fetuses)