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Table 1 Intraobserver repeatability of fetal biometry and Doppler assessment

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

  n Repeat measurements Mean difference SE Cronbach’s α value
Nasal bone length 60 2 −0.0033 0.06369 0.999
Biparietal diameter 44 2 −0.0591 0.13224 0.997
Head circumference 44 2 0.1682 0.12055 0.999
Humerus length 44 2 0.1045 0.06950 0.999
Radius length 44 2 0.0523 0.07045 0.998
Ulna length 44 2 0.0182 0.08455 0.998
Femur length 44 2 0.1182 0.07557 0.999
Tibia length 44 2 0.0318 0.06950 0.999
Fibula length 44 2 0.0295 0.08636 0.998
UA PI 60 2 0.0017 0.01659 0.999
UA RI 60 2 0.0010 0.00986 0.997
MCA PI 60 2 −0.0030 0.01816 0.997
MCA RI 60 2 0.0003 0.00367 0.999
  1. MCA, middle cerebral artery; PI, pulsatility index; RI, resistance index; SE, standard error (difference in the paired measurements); UA, umbilical artery.