Table 4.

Interobserver and intraobserver variability for myocardial work indices

	Interobserver variability			Intraobserver variability
	ICC	95% CI	SEM	ICC	95% CI	SEM
Global work index (mm Hg%)	0.94	0.867-0.974	45.64	0.936	0.853-0.972	47.43
Global constructive work (mm Hg%)	0.899	0.79-0.953	55.35	0.909	0.795-0.961	56.08
Global wasted work (mm Hg%)	0.849	0.661-0.937	14.5	0.829	0.64-0.923	14.2
Global work efficiency (%)	0.887	0.741-0.953	0.53	0.863	0.695-0.942	0.55

Abbreviations: ICC = intraclass correlation coefficient; SEM = standard error of measurement.