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Figure 3 The probability of classification as Q-wave (QW) myocardial infarction (MI) by Thrombolysis In Myocardial Infarction (TIMI) criteria plotted against the quintiles of transmural extent (left graph), or total MI size (right graph). As both the transmural extent and the total size of MI increases, so the likelihood of classification as QW MI increases, for anterior and inferior but not lateral territories. Gray bars = lateral; cross-hatched bars = anterior; white bars = inferior.