Supplementary Table 4.

Results of sensitivity analyses examining association between MA and CHD.

Matching method	Caliper	No (%) of CHD patients	OR (95% CI)	p value
The nearest-neighbor Mahalanobis matching with replacement	0.20	48 (41.4%)	1.13 (1.02–1.26)	0.03
	0.25	49 (41.9%)	1.15 (1.03–1.29)	0.01
	NA	51 (43.2%)	1.15 (1.04–1.30)	0.01
The 1: 1 nearest-neighbor matching	0.20	45 (37.2%)	1.15 (1.03–1.29)	0.01
	0.25	46 (36.8%)	1.14 (1.03–1.28)	0.02
	NA	51 (37.5%)	1.13 (1.02–1.25)	0.02

NA=matching without a caliper. Matched factors included age, sex, the year of physical examination and medication history (antiplatelet drug and lipid-lowering drug). Models were adjusted for age, sex, the year of physical examination. CI – confidence interval; CHD – coronary heart disease; MA – maximum amplitude; OR – odds ratio.