Data collection:
On daily basis staff reviewed medical records and interviewed recruited
AMI patients using a structured interviewer-administered questionnaire
to record sociodemographic data, self-reported history of recent
respiratory symptoms including fever, cough, sore throat, runny nose and
difficulty breathing within past week of AMI onset, information on
lifestyle and co-morbid illness and conducted clinical examination as
well as anthropometric measurements of the participants. The blood
cardiac troponin results were obtained from hospital records measured at
baseline in nanograms per millilitre (ng/mL).