When stratified by original SYNTAX tertiles , 30-day and 1-year rates of definite/probable ST were significantly greater in the highest ( SS > 32 ; 6.3 % and 8.8 % ) and intermediate tertiles ( SS = 23-32 ; 2.8 % and 3.7 % ) compared with the lowest tertile ( SS < 22 ; 0.8 % and 1.2 % ) , P < 0.0001 for both .