Table 3.

Clinical characteristics of patients K-means clustering results (N = 248).

Clinical characteristics of patients	Cluster		P value
	Low risk group (n = 144)	High risk group (n = 104)
Zscore: ED subgroup	−0.47367	0.65585	P < 0.05
Zscore: Number	−0.57275	0.79304	P < 0.05
Zscore: CHD subgroup	−0.49779	0.68925	P < 0.05
Zscore: No. of stenotic vessels	−0.59051	0.81762	P < 0.05
Zscore: Degree of stenosis	−0.4774	0.66102	P < 0.05
Zscore: Time from ED to CHD onset (months)	0.2588	−0.35834	P < 0.05

ED, erectile dysfunction; CHD, coronary heart disease.