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Table 1: 
CT and MR imaging data of patients who underwent either prenatal or postnatal surgical repair of an ONTD, according to whether they required HTa
 HTNo HTP Value
Combined prenatal and postnatal    
 Mean basiocciput convexity (mm)2.6 (SD, 0.9)1.6 (SD, 0.9)<.001
 Mean basiocciput length (mm)15.2 (SD, 1.8)17.3 (SD, 2.2)<.001
 Mean basiocciput convexity/length ratio0.17 (SD, 0.06)0.1 (SD, 0.06)<.001
 Mean convexity of PAOM (mm)2.6 (SD, 1.6)1.9 (SD, 1.4).003
 Mean lateral ventricle width (mm)35.1 (SD, 26.2)29.4 (SD, 9.9).10
 Mean FOD (mm)134.8 (SD, 17.2)152.2 (SD, 15.5)<.001
 Mean PFD (mm)51.4 (SD, 9.2)65.9 (SD, 9.6)<.001
 Mean FOD/PFD ratio2.7 (SD, 0.4)2.3 (SD, 0.2)<.001
Prenatal only   
 Mean basiocciput convexity (mm)2.3 (SD, 0.7)1.5 (SD, 0.8)<.001
 Mean basiocciput length (mm)15.6 (SD, 2.1)17.7 (SD, 2.2)<.001
 Mean basiocciput convexity/length ratio0.15 (SD, 0.05)0.08 (SD, 0.05)<.001
 Mean convexity of PAOM (mm)2.6 (SD, 1.9)1.9 (SD, 1.4).09
 Mean lateral ventricle width (mm)35 (SD, 10.9)28.8 (SD, 9.9).02
 Mean FOD (mm)140.5 (SD, 19.0)154.2 (SD, 12.6)<.001
 Mean PFD (mm)56 (SD, 10.4)67.3 (SD, 8.0<.001
 Mean FOD/PFD ratio2.6 (SD, 0.3)2.3 (SD, 0.2)<.001
Postnatal only   
 Mean basiocciput convexity (mm)2.8 (SD, 0.9)1.9 (SD, 1.0)<.001
 Mean basiocciput length (mm)15 (SD, 1.6)16.5 (SD, 2.0).002
 Mean basiocciput convexity/length ratio0.19 (SD, 0.06)0.12 (SD, 0.07)<.001
 Mean convexity of PAOM (mm)2.7 (SD, 1.5)1.8 (SD, 1.5).02
 Mean lateral ventricle width (mm)35.1 (SD, 31.2)30.7 (SD, 10.0).53
 Mean FOD (mm)131.6 (SD, 15.5)148 (SD, 20.0)<.001
 Mean PFD (mm)48.9 (SD, 7.5)62.8 (SD, 11.8)<.001
 Mean FOD/PFD ratio2.7 (SD, 0.4)2.4 (SD, 0.2)<.001
  • ↵a Data are presented as mean (SD). P values were determined by an unpaired Student t test.