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Table 2: Fetal MR imaging biometric parameters of sIUFD fetuses (n = 29), singleton (n = 49), and twins control (n = 28) groups^{^a}
  sIUFD (n = 29) Mean ± SD Singleton (n = 49)Mean ± SD Twins Control (n = 28)Mean ± SD Significance (P Value)
sIUFD vs Singleton sIUFD vs Twins Control Twins vs Singleton Controls
FOD (mm) 88.4 ± 4.4 91.5 ± 6.5 90.5 ± 4.9 .01^{^b} .09 .43
FOD (%) 50.7 ± 18.6 64.2 ± 22.0 59.9 ± 25.9 .01^{^b} .13 .46
BPD (mm) 68.0 ± 3.9 71.7 ± 6.2 70.4 ± 3.8 .00^{^b} .02^{^b} .25
BPD (%) 36.9 ± 17.6 56.9 ± 22.5 46.9 ± 24.4 .00^{^b} .08 .08
CC (mm) 36.8 ± 2.9 37.9 ± 2.4 37.4 ± 2.0 .08 .31 .39
CC (%) 38.9 ± 22.9 48.2 ± 17.5 43.2 ± 22.3 .07 .48 .32
TCD (mm) 37.8 ± 2.1 39.1 ± 3.7 38.4 ± 2.4 .05^{^b} .37 .29
TCD (%) 44.1 ± 21.0 51.7 ± 23.3 43.2 ± 23.5 .14 .88 .13
Vermian height (mm) 18.4 ± 1.2 18.4 ± 1.6 18.3 ± 1.1 .94 .84 .89
Vermian height (%) 61.6 ± 18.6 56.5 ± 20.1 57.0 ± 18.3 .27 .35 .92
Vermian_AP (mm) 11.8 ± 1.0 12.0 ± 1.2 11.6 ± 1.0 .59 .32 .12
Vermian_AP (%) 48.6 ± 19.5 46.5 ± 18.5 46.1 ± 16.8 .66 .60 .92
Average lateral ventricles 6.4 ± 1.3 7.3 ± 1.2 7.8 ± 1.6 .01^{^b} .00^{^b} .17
Note:—FOD indicates fronto-occipital diameter; BPD, biparietal diameter, CC, corpus callosum; TCD, transcerebellar diameter; AP, anterior-posterior.
↵a Variables are presented as mean (SD). MR imaging centiles in fetal CNS biometry are based on Tilea et al.¹⁶
↵b Statistically significant values.