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

Table 1 Intraobserver repeatability of fetal biometry and Doppler assessment

	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

MCA, middle cerebral artery; PI, pulsatility index; RI, resistance index; SE, standard error (difference in the paired measurements); UA, umbilical artery.

ISSN: 2047-783X