Table 2.

Incremental increase in cost by RA duration and severity

	Coefficient	ME	P-value	Lower 95% CI	Upper 95% CI
Cost model		(€)
Disease duration	0.053	1075*	0.004	0.017	0.088
Change per unit increase in DAS28	0.157	360*	0.004	0.050	0.264
Age	0.005	NR	0.364	−0.006	0.017
Sex (female)	−0.171	NR	0.268	−0.472	0.131
BMI	−0.001	NR	0.967	−0.041	0.039
Constant	7.645	NR	0.000	6.740	8.550
Overall work impairment model		(%)
Change per unit increase in DAS28	NR	4.7*	0.011	1.1	8.4
Mild vs no pain	NR	33.3*	0.022	4.9	61.8
Moderate vs no pain	NR	43.4*	0.004	13.6	73.2
Severe vs no pain	NR	45.0*	0.009	11.2	78.9

Costs are formatted as follows: cost (subgroup sample size).

ME: marginal effect; NR: not reported.

^* P < 0.05.