Adjusting AVA by VR increased predictive accuracy for aortic valve events ( area under the receiver operating curve 0.62 ( 95 % CI 0.57 to 0.67 ) vs 0.56 ( 95 % CI 0.51 to 0.61 ) for AVA , p = 0.02 ) with net reclassification improvement calculated at 0.36 ( 95 % CI 0.17 to 0.54 , p < 0.001 ) .