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. 2020 Dec 30;73(1):90–99. doi: 10.1002/acr.24386

Figure 1.

Figure 1

Additional health care utilization related to rheumatoid arthritis and psychiatric disorders, modeled with negative binomial regression. Rates are the number of visits per year, the number of hospital days per year, and the number of drug categories per year. Adjusted for psychiatric comorbidity only. RA = rheumatoid arthritis; CNT = matched control; PSYC = active psychiatric disorder; RA vs. CNT = additional health care use due to RA diagnosis; between‐person RA with PSYC vs. RA without PSYC = additional health care use for RA with active psychiatric disorder versus RA without psychiatric disorder; within‐person RA with PSYC vs. RA without PSYC = within an individual, additional health care use associated with periods of active psychiatric disorder versus periods without active psychiatric disorder.