. Author manuscript; available in PMC: 2016 Dec 1.

Published in final edited form as: Arthritis Care Res (Hoboken). 2015 Dec;67(12):1712–1721. doi: 10.1002/acr.22636

Table 4.

Adjusted incidence rate ratios (IRR) of acute care utilization (emergency department (ED) visits and hospitalizations), comparing nonadherers (MPR<80%) to adherers (MPR ≥80%)

		All-cause		SLE-related
		IRR^*	95% CI	IRR^*	95% CI
ED Visits	HCQ	1.55	1.43–1.69	1.60	1.43–1.80
ED Visits	IS	1.64	1.42–1.89	1.69	1.38–2.05

Hospitalizations	HCQ	1.37	1.25–1.50	1.30	1.18–1.44
Hospitalizations	IS	1.67	1.41–1.96	1.60	1.34–1.91

Incidence Rate Ratios (IRR) compare nonadherers (medication possession ratio, MPR<80%) to adherers (MPR≥80%) with 95% confidence intervals. Multivariable Poisson regression models adjusted for calendar year, age, gender, race/ethnicity, geographic region, socioeconomic status, SLE risk-adjustment index and baseline number of medications