Table 2.

Intraobserver and interobserver variability of manual and automatic biometric measurements for fetal head.

Parameters (head)	Intraobserver variability-E1a	Intraobserver variability-E2	Interobserver variability-E1 versus E2	Our method (GT = E1)
BPD (mm)	0.18 (0.52)b	$-0.16(1.23)$	1.23 (1.53)	$-0.038$ (1.38)
OFD (mm)	0.78 (1.66)	$-0.41(2.02)$	2.76 (2.58)	$-0.20$ (2.98)
HC (mm)	1.55 (2.86)	$-0.91(3.79)$	6.37 (5.04)	$-0.72$ (5.36)

^aE1 = Expert 1, E2 =Expert 2.

^bResults are given as an average value (standard deviation) for each measure.