Table 5. Interobserver and intraobserver variability.

Variables	Interobserver variability				Intraobserver variability
	ICC	95% CI	P value		ICC	95% CI	P value
GLS	0.959	0.884–0.986	<0.001		0.956	0.875–0.985	<0.001
PSD	0.984	0.953–0.994	<0.001		0.993	0.978–0.998	<0.001
GWI	0.942	0.839–0.980	<0.001		0.948	0.854–0.982	<0.001
GCW	0.997	0.996–1.000	<0.001		0.993	0.980–0.998	<0.001
GWW	0.964	0.945–0.994	<0.001		0.981	0.946–0.994	<0.001
GWE	0.950	0.859–0.983	<0.001		0.978	0.938–0.993	<0.001

ICC, intraocular correlation coefficient; CI, confidence interval; GLS, global longitudinal strain; PSD, peak strain dispersion; GWI, global work index; GCW, global constructive work; GWW, global wasted work; GWE, global work efficiency.