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Cox proportional hazards ratio regression demonstrating survival free from angiographic cardiac allograft vasculopathy according to the backward decompression wave (BDW). The most appropriate BDW cut-off value (−4.44 × 10− 3 W/m2/ s) was determined by receiver-operator characteristic-curve analysis. Angiographic cardiac allograft vasculopathy was ISHLT Grade 1 or above.
