Table 3. Contingency of phenotypic and clinical manifestations of atherosclerosis with the level of C3256T heteroplasmy of mitochondrial genome.

Manifestation	Number of study participants		Chi-square	P-value	Statistical power (1-β)
	Low heteroplasmy level (cluster 1, n = 138)	High heteroplasmy level (cluster 2, n = 53)
The presence of carotid atherosclerotic plaques	55 (39.8%)	52 (98.1%)	52.75	<0.001	100%
The presence of CHD	24 (17.4%)	21 (39.6%)	10.51	0.002	89%
The history of myocardial infarction	2 (1.4%)	5 (9.4%)	6.92	0.018	60%