The chest pain characteristic: group <65 years old presenting with typical chest pain was higher than in group ≥65 years old (72.61% compared to 36.13%, p<0.001); whereas those presenting atypical chest pain and painlessness in group <65 years old were 20.38% and 7.01%, respectively, and in group ≥65 years old 34.19% and 29.68%, respectively, p<0.001.