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Table 2 Distribution of study parameters (multiples of medians)

From: Prenatal ultrasonography and Doppler sonography for the clinical investigation of isolated ventricular septal defects in a late second-trimester population

  19 weeks 20 weeks 21 weeks 22 weeks 23 weeks 24 weeks
Nasal bone length 0.96 0.93 0.95 0.96 0.92 0.90
Biparietal diameter 0.94 0.99 0.98 0.99 0.99 0.97
Head circumference 0.97 0.98 0.98 0.99 0.99 0.98
Abdominal circumference 1.00 0.99 0.98 0.96 0.99 0.99
Femur length 0.99 0.94 0.97 0.97 1.00 0.98
Tibia length 0.98 0.97 0.97 0.98 0.99 0.97
Fibula length 1.00 0.97 0.97 0.98 0.99 0.97
Humerus length 0.95 0.99 0.99 0.98 0.97 0.98
Radius length 0.99 0.96 0.98 0.98 0.98 0.95
Ulna length 1.00 0.99 0.99 0.99 0.99 0.97
Estimated FBW 0.97 0.96 0.96 0.94 0.97 0.99
UA PI 1.60 1.06 1.04 1.06 1.06 1.06
UA RI 1.22 1.05 1.03 1.03 1.01 1.03
MCA PI 0.88 0.95 0.98 0.90 0.92 0.89
MCA RI 0.94 1.00 0.99 0.96 0.98 0.96
MCA/UA PI ratio 0.61 0.93 0.99 0.88 0.99 0.99
MCA/UA RI ratio 0.77 0.98 1.00 0.95 0.96 0.98
  1. FBW, fetal body weight; MCA, middle cerebral artery; MCA/UA PI ratio, ratio of middle cerebral artery resistance index to umbilical artery pulsatility index; MCA/UA RI ratio, ratio of middle cerebral artery resistance index to umbilical artery resistance index; PI, pulsatility index; RI, resistance index; UA, umbilical artery.