Table 7.

Correlation between MCA PI and RI, UA PI and RI, CP ratio and MCA PI, and CP ratio and UA PI for gestational period 18–40 weeks.

Gestational age in weeks (N)	Correlation of MCA PI and RI (P value)	Correlation of UA PI and RI (P value)	Correlation of CP ratio and MCA PI (P value)	Correlation of CP ratio and UA PI (P value)
18 (34)	0.077 (0.665)	0.431 (0.011)	0.635 (0.000)	−0.806 (0.000)
19 (66)	0.838 (0.000)	0.688 (0.000)	−0.175 (0.160)	−0.859 (0.000)
20 (38)	0.376 (0.020)	0.863 (0.000)	0.394 (0.014)	−0.517 (0.000)
21 (31)	0.722 (0.000)	0.808 (0.000)	0.137 (0.462)	−0.614 (0.000)
22 (23)	0.446 (0.033)	0.935 (0.000)	−0.057 (0.797)	−0.724 (0.000)
23 (56)	0.691 (0.000)	0.942 (0.000)	0.041 (0.763)	−0.746 (0.000)
24 (46)	0.796 (0.000)	0.851 (0.000)	−0.028 (0.854)	−0.592 (0.000)
25 (39)	0.543 (0.000)	0.932 (0.000)	0.151 (0.358)	−0.775 (0.000)
26 (39)	0.829 (0.000)	0.933 (0.000)	0.131 (0.476)	−0.729 (0.000)
27 (25)	0.818 (0.000)	0.961 (0.000)	0.027 (0.897)	−0.772 (0.000)
28 (37)	0.695 (0.000)	0.774 (0.000)	0.061 (0.721)	−0.869 (0.000)
29 (43)	0.803 (0.000)	0.951 (0.000)	−0.193 (0.215)	−0.840 (0.000)
30 (27)	0.471 (0.013)	0.911 (0.000)	−0.028 (0.888)	−0.803 (0.000)
31 (46)	0.809 (0.000)	0.959 (0.000)	−0.264 (0.076)	−0.863 (0.000)
32 (31)	0.634 (0.000)	0.932 (0.000)	−0.169 (0.363)	−0.879 (0.000)
33 (38)	0.804 (0.000)	0.935 (0.000)	0.036 (0.829)	−0.862 (0.000)
34 (29)	0.884 (0.000)	0.968 (0.000)	−0.436 (0.018)	−0.898 (0.000)
35 (25)	0.728 (0.000)	0.905 (0.000)	−0.366 (0.072)	−0.857 (0.000)
36 (27)	0.739 (0.000)	0.907 (0.000)	0.039 (0.849)	−0.822 (0.000)
37 (29)	0.549 (0.002)	0.943 (0.000)	0.555 (0.002)	−0.594 (0.001)
38 (18)	0.849 (0.000)	0.984 (0.000)	−0.035 (0.890)	−0.833 (0.000)
39 (17)	0.781 (0.000)	0.971 (0.000)	0.107 (0.683)	−0.899 (0.000)
40 (3)	0.317 (0.795)	0.994 (0.071)	−0.999 (0.028)	−1.000 (0.013)