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Table 1: 
Mean and SDs of different parameters for the controls and fetuses with nonoperated and operated spinal dysraphism
Controls (n = 274)Nonoperated OSD (n = 52)Postoperative OSD (n = 23)
GA (wk)27.9 (5.3)23.6 (0.3)26.0 (1.1)
VW (mm)6 (1.6)11.9 (4.6)12.3 (3.6)
PF area (cm2)7.4 (2.2)3.1 (0.9)4.44 (0.83)
TDPF (mm)39.8 (7.1)22.3 (3.4)27.2 (4.1)
TCD (mm)31.6 (6.4)21.8 (3)24.4 (3.3)
Ratio TCD/TDPF0.79 (0.05)1 (0.05)0.9 (0.07)
CHL (mm)8.8 (1.9)−9.3 (5.4)−0.7 (5.2)
CSA87.1° (8.3°)62.5° (9.7°)76.6° (10.9°)