Procedural characteristics among the four groups of subjects.

SVD indicates single vessel disease; TVD, triple vessel disease; LM, left main trunk artery disease; CTO, chronic total occlusion; CB, cutting balloon; ST, stent; ST failure, stent delivery failure; SNC, stented non-calcified plaque; SSC, stented spotty calcified plaque; SMC, stented medium calcified plaque; SHC, stented heavy calcified plaque; PP, pressure of balloon pre-dilation; DP, diameter of pre-dilation balloon; BDT, time of balloon dilated.b pa indicates a significant difference of pd pc indicates a significant difference of pf pe indicates a significant difference of p