Table 4. Relative risk by quartiles of serum Mg level according to different clinical presentation.

	Serum Mg level (mM)
	Q1	Q2	Q3	Q4
Unstable angina
Serum Mg level(mM)	<0.87	0.87–0.92	0.93–0.98	>0.98
No. of patients	54	59	60	60
No. of MACEs	8	9	6	9
Death	1	1	0	0
Myocardial infarction	2	0	1	3
Repeat PCI	5	7	6	7
Coronary artery bypass grafting	1	1	0	0
Relative risk (95% CI) #	1.38(0.51–3.72)	1.1 (0.42–2.9)	0.63(0.22–1.83)	1
Myocardial infaction
Serum Mg level(mM)	<0.86	0.86–0.90	0.91–0.94	>0.94
No. of patients	41	46	47	47
No. of MACEs	8	7	3	2
Death	0	1	0	0
Myocardial infarction	5	3	1	2
Repeat PCI	6	5	3	1
Coronary artery bypass grafting	0	0	0	0
Relative risk (95% CI) #	8.11(1.7–38.75) **	6.47(1.3–32.2) *	2.05(0.34–12.33)	1

95% CI, 95% confidence interval.

*P<0.05, **P<0.01.

# adjusted for age, positive family history, smoking status, hypertension, hypercholesterolemia, and diabetes at baseline.