指标

28~31⁺⁶ W

32~34⁺⁶ W

35~36⁺⁶ W

≥37周

F/Z

P

AT (ms)

31.76 ± 3.02

36.38 ± 4.41^*

40.12 ± 5.39^*

46.23 ± 6.13^*#&

80.953

<0.001

ET (ms)

175.54 ± 7.16

179.46 ± 8.66

180.72 ± 7.44^*

180.65 ± 7.93^*

3.373

0.020

AT/ET

0.18 ± 0.02

0.20 ± 0.03^*

0.22 ± 0.03^*

0.26 ± 0.04^*#&

75.135

<0.001

PSV (cm/s)

72.40 ± 9.43

78.82 ± 9.69^*

79.09 ± 10.49^*

81.62 ± 12.54^*

16.783

0.001

RI (ms)

0.85 ± 0.03

0.85 ± 0.04

0.84 ± 0.03

0.83 ± 0.03

5.113

0.164

PI (ms)

2.05 ± 0.15

2.07 ± 0.14

2.02 ± 0.16

1.99 ± 0.15

1.867

0.138

内径(mm)

6.07 ± 0.54

6.84 ± 0.63^*

7.65 ± 0.67^*#

8.39 ± 0.89^*#

90.648

<0.001