Table 1.

Characteristics of the ONFH study group

	Total (n = 68)	Idiopathic (n = 45)	Secondary (n = 23)
Gender (M/F)	56/12 (82.35 %/17.65 %)	38/7 (84.44 %/15.56 %)	18/5 (78.26 %/21.74 %)
Age (years)	44.98 (15–77)	44.42 (15–77)	46.08 (20–74)
Smoking	27 (39.7 %)	21 (46.66 %)	6 (26.06 %)
Diabetes mellitus	8 (11.76 %)	4 (8.88 %)	4 (17.39 %)
Coronary disease	3 (4.41 %)	2 (4.44 %)	1 (4.34 %)
Thrombosis	1 (1.47 %)	0	1 (4.34 %)
Leriche syndrome	1 (1.47 %)	1 (2.22 %)	0
Hypertension	13 (19.11 %)	8 (17.77 %)	5 (21.73 %)
Hyperlipidaemia	1 (1.47 %)	1 (2.22 %)	0