Ultrasound findings

AGA fetus

SGA fetus

p-value (Significance)

Duration of study (min)

14.6 (3.3)

13.7 (5.0)

0.57

Number of recordings

34 (4)

29 (8.5)

0.028

MCA PI with no movements

1.68 (0.31)

1.50 (0.35)

<0.005$

MCA PI with body movements

1.34 (0.31)

1.16 (0.21)

MCA PI with breathing movements

1.37 (0.31)

1.25 (0.19)

MCA PI < 5^th centile without movements

0/235 (0.0%)

95/245 (38.8%)

<0.005

Number of readings with MCA PI < 5th centile with body movements (%)

32/64 (50%)

137/146 (93.83%)

<0.005

Number of readings with MCA PI < 5th centile with breathing movements (%)

66/88 (75%)

73/91 (80.2%)

0.402

Median % fall in MCA PI with body movements (Range)

17.56%

(64.38% to - 31.68%)

10.99%

(56.29% to - 66.18%)

0.001*

Median % fall in MCA PI with breathing movements (Range)

18.57%

(48.41% to -37.31%)

6.76%

(45.67% to - 103.39%)

<0.001*

Median time to recovery after no movements in seconds (Range)

20 (12 to 169)

17 (12 to 105)

0.47*