Group Number recurrent AMI cardiogenic shock arrhythmia heart failure Total incidence
Observation 50 0(0.00) 0(0.00) 2(4.00) 1(2.00) 3(6.00)
Control 50 1(2.00) 1(2.00) 5(10.00) 3(6.00) 10(20.00)
χ2 4.332
P 0.037