†RR: Unadjusted
risk ratio
‡aRR: Adjusted risk ratio; Adjusted for age, sex,
tobacco use, hypertension, diabetes, high blood cholesterol, heart
failure, exercise level, previous history of CHD, family history of CVD
and BMI
§Includes both annual influenza seasons of 2017 and
2018
Table 4. Association of clinical respiratory illness with high
level of troponin in blood among patients with myocardial infarction by
study seasons