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Table 2: 
CT and MR imaging data of all patients regardless of whether they received HT, according to whether they received prenatal or postnatal surgical repair of an ONTDa
 All patientsPrenatalPostnatalP Value
Mean basiocciput convexity (mm)1.8 (SD, 0.9)2.5 (SD, 1.0)<.001
Mean basiocciput length (mm)16.9 (SD, 2.4)15.4 (SD, 1.9)<.001
Mean basiocciput convexity/length ratio0.11 (SD, 0.06)0.17 (SD, 0.07)<.001
Mean convexity of PAOM (mm)2.2 (SD, 1.6)2.4 (SD, 1.5).35
Mean lateral ventricle width (mm)31.1 (SD, 10.6)33.8 (SD, 27.0).44
Mean FOD (mm)149.1 (SD, 16.6)136.6 (SD, 18.4)<.001
Mean PFD (mm)63.1 (SD, 10.5)53.1 (SD, 11.1)<.001
Mean FOD/PFD ratio2.4 (SD, 0.3)2.6 (SD, 0.4)<.001
  • ↵a Data are presented as mean (SD). P values were determined by an unpaired Student t test.