BMC Health Services Research

Table 4 Relative risk for hospital admission calculated using a negative binomial regression model

From: The effects of continuity of care on hospital utilization in patients with knee osteoarthritis: analysis of Nationwide insurance data

Category	Unadjusted				Adjusted^a
Category	RR	95% CI		P-value	RR	95% CI		P-value
Gender
Male	1.00				1.00
Female	1.88	0.58	0.68	< 0.0001	1.24	0.16	0.27	< 0.0001
Age (yr)
≤29	1.00				1.00
30–39	1.77	0.41	0.73	< 0.0001	1.51	0.24	0.58	< 0.0001
40–49	3.51	1.13	1.38	< 0.0001	1.94	0.96	0.36	< 0.0001
50–59	6.52	1.76	1.99	< 0.0001	4.56	1.85	1.18	< 0.0001
60–69	7.77	1.94	2.17	< 0.0001	14.04	2.99	2.29	< 0.0001
≥70	8.89	2.07	2.30	< 0.0001	13.72	2.97	2.27	< 0.0001
Payer type
National health insurance	1.00				1.00
Medicaid	2.00	0.61	0.78	< 0.0001	1.13	0.03	0.21	0.013
Others	1.38	0.39	1.02	0.375	1.98	0.07	1.44	0.075
Hospital type
General hospital	8.41	2.03	2.23	< 0.0001	12.50	2.40	2.65	< 0.0001
Hospital	9.04	2.12	2.29	< 0.0001	11.50	2.35	2.53	< 0.0001
Clinic	43.32	3.65	3.89	< 0.0001	57.54	3.91	4.20	< 0.0001
Long-term care hospital	2.04	0.63	0.80	< 0.0001	2.00	0.61	0.78	< 0.0001
Oriental hospital	8.67	1.96	2.36	< 0.0001	9.56	2.04	2.48	< 0.0001
Oriental clinic	1.00				1.00
Region
Urban	1.00				1.00
Rural	0.94	0.10	0.01	0.010	0.99	0.06	0.04	0.643
Ownership
Public	1.00				1.00
Corporate	1.60	0.26	0.68	< 0.0001	1.69	0.30	0.75	< 0.0001
Private	0.47	0.96	0.56	< 0.0001	1.72	0.31	0.77	< 0.0001
COC
0.76–1.00	1.00				1.00
0.51–0.75	8.88	2.10	2.27	< 0.0001	6.03	1.71	1.89	< 0.0001
0.26–0.50	13.50	2.51	2.69	< 0.0001	8.56	2.05	2.24	< 0.0001
0.00–0.25	17.36	2.68	3.03	< 0.0001	27.17	3.09	3.51	< 0.0001
Low (< 3 visits)	0.64	0.55	0.33	< 0.0001	2.66	0.80	1.15	< 0.0001
Deviance/df					1.089
LL					− 5667.230
LL χ²					799.779
AIC					11,378.461
BIC					11,523.402

^aFitness information of the adjusted model
Abbreviations: LL likelihood ratio, AIC akaike information criterion, BIC bayesian information criterion

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