TABLE 3.

Adjusted Association Between Health Care Costs and PRO Measures in Patients With PsA Who Completed the HAQ-DI

Medical costs, USD	Primary analysisa (N = 828)	Sensitivity analysisb (N = 828)
Total health care
Base value	15,804	15,647
Incremental amountc (95% CI)	1.13 (1.03-1.23)d P = 0.007	1.13 (1.02-1.25)e P = 0.017
Total medical f
Base value	4,238	2,299
Incremental amountc (95% CI)	1.38 (1.13-1.69)d P = 0.002	1.41 (1.14-1.74)d P = 0.002
Pharmacy
Base value	9,730	8,769
Incremental amountc (95% CI)	1.06 (0.96-1.18) P = 0.227	1.09 (0.96-1.22) P = 0.164

^a Adjusted for covariates significant at 5% in bivariate analyses: geographic region, rheumatic disease comorbidity index, and opioid use.

^b Model adjusted for race, income, education, and geographical area.

^c Multiplicative factor that represents the incremental dollar amount for change from corresponding base value per 1-unit increase in HAQ-DI score.

^d P < 0.01.

^e P < 0.05.

^f Includes costs for hospitalizations, emergency department visits, outpatient visits, procedures, and diagnostic tests.

HAQ-DI = Health Assessment Questionnaire Disability Index; PRO = patient-reported outcome; PsA = psoriatic arthritis; USD = US dollar.