Table 3.

Genotype frequencies, OR and 95 % CIs of the eNOS polymorphism in ONFH patients (total, idiopathic and secondary) versus controls

		Patients
	Control (n = 100)	Total (n = 68)	Idiopathic (n = 45)	Secondary (n = 23)
4a/a	1 (1 %)	3 (4.41 %)	1 (2.22 %)	2 (8.70 %)a
4a/b	16 (16 %)	25 (36.76 %)b	16 (35.56 %)c	9 (39.13 %)d
4b/b	83 (83 %)	40 (58.82 %)	28 (62.22 %)	12 (52.17 %)

^a p = 0.036, OR = 13.83, 95 % CI 1.16–164.4

^b p = 0.0011, OR = 3.24, 95 % CI 1.55–6.74

^c p = 0.0069, OR = 2.96, 95 % CI 1.31–6.69

^d p = 0.0073, OR = 3.89 95 % CI 1.4–10.75