Table 2. Difference of the troponin I level between the event and no event groups and the proportion of events.

Variables	Event (n=101)	Non-event (n=532)	No. of patients with events/No. of total patients (%)	P value
cTnI-1, µg/L	0.18 (0.095–0.385)	0.135 (0.06–0.25)		0.002
cTnI-2, µg/L	0.27 (0.096–1.35)	0.12 (0.059–0.28)		<0.001
Absolute change, µg/L	0.177 (0.056–0.885)	0.074 (0.027–0.22)		<0.001
Quartiles
Quartile 1	23	135	14.6
Quartile 2	17	146	10.4
Quartile 3	16	138	10.4
Quartile 4	45	113	28.5
Trends
Low to low	19	194	8.9
Low to high	23	73	24.0
High to low	8	76	9.5
High to high	51	189	21.3

Values are expressed as median (interquartile range) or n. cTnI-1 = measurement of cardiac troponin I levels less than 1 hour after CABG; cTnI-2 = measurement of cardiac troponin I levels between 12–18 hours after coronary artery bypass grafting; absolute change in cTnI levels = absolute value of the first sampling time of the cTnI concentration minus the second sampling time of the cTnI concentration.