Fig. 2

Geometric characteristics of 4 LM phenotypes. \(\alpha_{{{\text{LAD}} - {\text{LM}}}}\), angle between left anterior descending artery (LAD) and left main (LM) coronary artery; \(\alpha_{{{\text{LCX}} - {\text{LM}}}}\), angle between left circumflexus (LCX) and LM; \( \alpha_{{{\text{LAD}} - {\text{LCX}}}}\), angle between LAD and LCX; \(\alpha_{{{\text{ostia}}}}\), LM ostial title angle; \(\varphi_{{{\text{LM}}}}\), the diameter of LM; \(\varphi_{{{\text{LAD}}}} /\varphi_{{{\text{LM}}}}\), the ratio of LAD diameter to LM diameter; \(\varphi_{{{\text{LCX}}}} /\varphi_{{{\text{LM}}}}\), the ratio of LCX diameter to LM diameter; \(L_{{{\text{LM}}}}\), arc length of LM; \(\tau_{{{\text{LM}}}}\), tortuosity of LM; *p < 0.05; **p < 0.01; ***p < 0.001