According to the T wave changes after hospital discharge , patients were divided into four groups : stable positive T waves ( group 1 , n = 35 ) , patients who showed a decrease > or = 1 in nT NEG ( group 2 , n = 361 ) , patients with no change in nT NEG ( group 3 , n = 64 ) and those with an increase > or = 1 in nT NEG ( group 4 , n = 76 ) .
