Table 1 Mean ± SD of cardiac diameter, biparietal diameter (BPD) and C/B ratio for each gestational week, according to affected and unaffected fetuses

18

35

15.39 ± 1.27

17.67 ± 3.31

0.006

39.89 ± 1.06

38.68 ± 4.27

0.212

43.80 ± 4.84

53.46 ± 8.64

< 0.001

19

43

16.57 ± 1.59

19.04 ± 1.29

< 0.001

43.02 ± 1.30

43.38 ± 0.94

0.408

42.44 ± 3.93

51.64 ± 3.93

< 0.001

20

27

17.25 ± 1.26

20.25 ± 1.28

< 0.001

46.99 ± 0.77

46.48 ± 0.95

0.248

41.98 ± 2.86

49.35 ± 3.76

< 0.001

21

15

18.49 ± 0.96

21.11 ± 1.17

< 0.001

50.52 ± 3.54

48.77 ± 3.50

0.353

42.72 ± 6.48

53.89 ± 7.80

< 0.001