Prevalence of PsA, axSpA & RA (2017) in Norwegian adults is 0.46%, 0.41%, & 0.78%. In 2017, 27.3% of RA patients, 25.7% of PsA patients and 35.1% of axSpA patients used biologic DMARDs (biologics more freq in youngers; infrequent if ≥55 yrs https://t.co/oqlpPmam6R