Twelve years with a capitation payment system in Swedish dental care: longitudinal development of oral health

BMC Oral Health

Table 4 Negative binomial regression analysis describing the influence of covariates on manifest caries incidence at the 6 and 12-year follow-ups, respectively

	B		SE		IRR¹		CI (95%)		p
	6 years	12 years	6 years	12 years	6 years	12 years	6 years	12 years	6 years	12 years
Constant	− 0.87	− 1.43	0.093	0.114	0.42	0.24	0.35–0.50	0.19–0.30	< 0.001	< 0.001
Payment system choice
DCH² (Ref.)					1	1
FFS³	0.41	0.33	0.57	0.69	1.51	1.39	1.35–1.69	1.22–1.59	< 0.001	< 0.001
Pre-baseline caries incidence
0 lesions (Ref.)					1	1
1–2 lesions	0.34	0.29	0.050	0.061	1.40	1.33	1.27–1.54	1.18–1.50	< 0.001	< 0.001
≥ 3 lesions	0.97	0.88	0.067	0.078	2.63	2.42	2.31–3.00	2.08–2.82	< 0.001	< 0.001
Age
years	− 0.01	− 0.01	0.002	0.002	0.99	0.99	0.98–0.99	0.99–0.99	< 0.001	< 0.001
Education
≥ 13 years . (Ref.)					1	1
≤ 12 years	0.11	0.31	0.048	0.062	1.12	1.36	1.02–1.23	1.20–1.53	0.021	< 0.001
Gender
♀ (Ref)					1	1
♂	− 0.02	0.21	0.044	0.054	0.98	1.24	0.90–1.07	1.11–1.38	0.649	< 0.001

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