Table 2. Potential risk factors of osteomyelitis of the jaw in all osteoporosis patients and oral bisphosphonate users.

	Osteoporosis patients (46 cases, 6,923 patients)						Bisphosphonate users (41 cases, 4,129 patients)
	Regression coefficient	Odds ratio	95% confidence interval		p		Regression coefficient	Odds ratio	95% confidence interval		p
Oral bisphosphonates, use vs. non-use	1.605	4.98	1.94	12.75	<0.01		-
Age, +10 years	0.247	1.28	1.03	1.60	0.03		0.269	1.31	1.03	1.67	0.03
Sex, men vs. women	-0.911	0.40	0.14	1.14	0.09		-1.493	0.22	0.05	0.95	0.04
Diabetes, yes vs. no	0.574	1.78	0.86	3.68	0.12		-0.050	0.95	0.41	2.18	0.91
Steroid, use vs. non-use	-0.209	0.81	0.36	1.84	0.62		0.509	1.66	0.78	3.56	0.19
Chemotherapy, use vs. non-use	-0.925	0.40	0.09	1.66	0.21		-0.890	0.41	0.10	1.73	0.22
Antirheumatic drugs, use vs. non-use	-0.045	0.96	0.44	2.08	0.91		-0.294	0.75	0.31	1.77	0.51
Biologic agents, use vs. non-use	0.756	2.13	0.57	7.91	0.26		1.007	2.74	0.71	10.60	0.14
Sex-chemotherapy interaction	2.460	11.70	1.46	93.64	0.02		3.067	21.48	2.14	215.21	0.01

*Risk indices were calculated by the sum of risk factors of an individual patient multiplied by the regression coefficient.