Table 2 Differences in Doppler and cCTG characteristics between Late FGR and Control group fetuses

UA_PI^a

1.08 ± 0.42

0.99 ± 0.27

NS

MCA_PI

1.24 ± 0.27

1.44 ± 0.18

0.03*

FHR (bpm)

136.03 ± 10.17

136.68 ± 8.27

NS

STV (ms)

5.90 ± 1.88

6.56 ± 1.75

< 0.006

LTV (ms)

19.64 ± 5.04

21.86 ± 4.91

0.001

Delta (ms)

37.42 ± 9.51

41.30 ± 8.70

0.001

II

0.84 ± 0.05

0.85 ± 0.05

NS

ApEn

1.29 ± 0.14

1.33 ± 0.17

0.03

LF (ms²)

81.62 ± 5.45

83.12 ± 4.10

0.01

MF (ms²)

13.1 ± 3.48

12.20 ± 3.03

0.03

HF (ms²)

5.29 ± 3.80

4.68 ± 2.20

NS

LF/(HF + MF)

4.10 ± 2.12

4.13 ± 2.07

NS

APRS (bpm)

0.36 ± 0.11

0.42 ± 0.10

< 0.001

DPRS (bpm)

−0.37 ± 0.12

− 0.45 ± 2.11

< 0.001