Since cTnI (contemporary or high-sensitivity) have different values for the 99th percentile of the ULN according to different cTn assay manufacturers, we divided the measured cTn value by the ULN of each cTn assay and recorded the results as “x ULN” to standardize the cTn measurements. Then, we categorized these measurements as an ordinal variable as <½ of ULN,> 1/2 of ULN,> 1–2 x ULN,> 2–5 x ULN,> 5–10 x ULN,> 10–50 x ULN and> 50 x ULN. Some troponin assays were reported as “more than … " or “less than … "Measurements reported as “More than …. " were known as > 10,000 x ULN. In our study only 2 patients' value was recorded as “more than … " and we included them in the group> 50 x ULN. The measurements reported as “less than …. " were recorded as 0.001 x ULN arbitrarily. Also, we dichotomized each measured cTn value according to the ULN as “negative or positive”, as commonly used in clinical practice.

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