Table 4.

Repeatability and reproducibility of particular parameters (ECI—elasticity index, HR—hardness ratio, IOS—internal os strain, EOS—external os strain, CL—cervix length, VCA—vagino-cervical angle, AoP—angle of progression, ICC—intraclass correlation coefficient, CI—confidence index).

	Intra-observer Variability			Inter-observer Variability
Parameter	ICC	95% CI	p	ICC	95% CI	p
ECI	0.917	0.883–0.941	<0.001	0.907	0.864–0.936	<0.001
HR	0.878	0.829–0.913	<0.001	0.826	0.747–0.880	<0.001
IOS	0.953	0.934–0.966	<0.001	0.918	0.880–0.943	<0.001
EOS	0.918	0.885–0.941	<0.001	0.918	0.881–0.944	<0.001
IOS/EOS	0.907	0.870–0.934	<0.001	0.851	0.784–0.898	<0.001
CL	0.993	0.990–0.995	<0.001	0.993	0.990–0.995	<0.001
VCA	0.988	0.983–0.991	<0.001	0.987	0.980–0.991	<0.001
AoP	0.983	0.977–0.988	<0.001	0.967	0.952–0.978	<0.001
Dilatation	0.994	0.992–0.996	<0.001	0.996	0.995–0.997	<0.001