The cardio Z App calculates Z-scores for Tissue Doppler derived time intervals. These include derived indices such as the myocardial performance index (which is calculated for the user), Isovolumetric contraction time (IVCT), the Isovolumic relaxation time (IVRT) and the ejection time (Et).
Tissue Doppler time interval Z-scores calculated from the data of Cui et al (2008) (Chicago)
The App includes diagrams of how measurements were made in the reference used, so help is never far away. The example below is the method used for tissue Doppler velocities and time intervals.