Killip levels at the time of hospitalization: group < 65 years old had Killip I of 75.33%, Killip II of 14%, Killip III & IV of 8% and 2.67%, respectively; group ≥ 65 years old had Killip I of 55.91%, Killip II of 26.52%, Killip III & IV of 12.19% and 5.38%, respectively. The rate of Killip II, III and IV in group ≥ 65 years old was higher than in group < 65 years old, p = 0.001.