Objective Health administrative data can be a valuable tool for disease surveillance and
research. Few studies have rigorously evaluated the accuracy of administrative databases for …

Background We have previously validated administrative data algorithms to identify patients
with rheumatoid arthritis (RA) using rheumatology clinic records as the reference standard. …

Objective To assess risk and risk factors for serious infections in seniors with rheumatoid
arthritis (RA) using a case–control study nested within an RA cohort. Methods We assembled a …

Objective Epidemiologic assessments of sufficiently large populations are required in order
to obtain robust estimates of disease prevalence and incidence, particularly when exploring …

Background: Population-based surveillance of Alzheimer’s and related dementias (AD-RD)
incidence and prevalence is important for chronic disease management and health system …

Incidence and prevalence estimates in myasthenia gravis have varied widely. Recent studies
based on administrative health data have large sample sizes but lack rigorous validation of …

Objective To compare mortality rates, underlying causes of death, excess mortality, and years
of potential life lost ( YPLL ) among patients with rheumatoid arthritis ( RA ) relative to the …

Objective To estimate the prevalence and incidence of psoriasis and psoriatic arthritis (PsA)
over time in Ontario, Canada. Methods We performed a population‐based study of Ontario …

… to Jessica Widdifield, PhD, 687 Pine Avenue West, V-Building, Room V2-09, Montreal, Quebec,
Canada H3H 2R9. E-mail: jessica.widdifield… Widdifield had full access to all of the data in …

Psoriatic arthritis (PsA) is an inflammatory musculoskeletal disease with a chronic,
progressive course. Various aspects of PsA, including its clinical features, disease course and …