Table 5

Results of regression analyses run separately for total, direct, and indirect costs

Dependent variable*	Adj. R2	Comparisons	B (SE)	p	Explanatory variables	B (SE)	p
*Dependent variable: log (costs per patient); †log (non-zero indirect costs); ‡proportional odds.
Total costs	0.31	RA v HBP	1.020 (0.096)	<0.0001	Education (3 levels)	0.022 (0.039)	0.577
		OA and HBP v HBP	0.249 (0.095)	0.009	Comorbidities (0–23)	0.302 (0.028)	<0.0001
		OA v HBP	0.132 (0.102)	0.196	Sex	−0.029 (0.072)	0.685
					Age (years)	0.002 (0.003)	0.437
Direct costs	0.24	RA v HBP	0.702 (0.085)	<0.0001	Education	0.014 (0.035)	0.552
		OA and HBP v HBP	0.217 (0.084)	0.010	Comorbidities (0–23)	0.276 (0.025)	<0.0001
		OA v HBP	0.050 (0.090)	0.580	Sex	0.095 (0.064)	0.139
					Age (years)	0.006 (0.003)	0.033
Indirect costs†	0.14	RA v HBP	0.396 (0.118)	0.118	Education	0.029 (0.080)	0.716
		OA and HBP v HBP	−0.189 (0.261)	0.468	Comorbidities (0–24)	0.027 (0.032)	0.399
		OA v HBP	0.343 (0.276)	0.215	Sex	−0.230 (0.177)	0.194
					Age (years)	−0.008 (0.006)	0.128
			OR (95% CI)			OR (95% CI)
Indirect costs‡	N/A	RA v HBP	1.71 (0.82 to 3.55)	0.040	Education	0.99 (0.79 to 1.26)	0.961
		OA&HBP v HBP	0.70 (0.33 to 1.50)	0.010	Comorbidities (0–24)	1.07 (0.98 to 1.18)	0.133
		OA v HBP	1.53 (0.68 to 3.40)	0.200	Sex	0.81 (0.48 to 1.35)	0.415
					Age (years)	0.99 (0.97 to 1.01)	0.283