Mean JT Duration

**Semantic type:** Quantitative Concept

**Definition:** The average (mean) duration (time) of the JT interval, obtained from a set of measurements of the JT interval. The JT interval is defined as the time from the J point (end of ventricular depolarization, the point at which the QRS meets the ST segment) to the end of the T wave (representing the end of ventricular repolarization).

**Synonyms:** - Summary (Mean) JT Interval