Infections requiring hospitalization in the abatacept clinical development program: an epidemiological assessment

Table 2 Characteristics of RA data sources used for epidemiologic analysis.

Data source	BC	PharMetrics	NOAR	NDB	Swedish ERA	Swedish inpatient*
Country	Canada	United States	United Kingdom	United States	Sweden	Sweden
Data type	Administrative data on physician visits, hospitalizations and medications	Administrative Claims data	Patient Questionnaire & assessment	Patient Questionnaire	Electronic medical records, patient assessment	Medical Records
Time covered	1996 to 2002	1998 to 2002	1990 to 1999	1998 to 2003	1994 to 2003	1990 to 2003
Number of RA patients in cohort	12,337	24,530	523	10,499	3,703	53,067
DMARD users	Prevalent users	Prevalent users	Incident users	Prevalent users	Incident users	Prevalent users
Outcome (infection) ascertainment	ICD-9 codes on claims and discharge summaries	ICD-9 codes on claims	ICD-9 codes in linked medical records	Patient-reported and verified by medical and hospital records	ICD-10 codes and verified by linking to hospital registry	ICD-10 codes in hospital registry

*The Sweden inpatient cohort is not a DMARD-only group and may contain patients on biologic therapy.
Characteristics of data sources used for identification of RA patients included in the epidemiologic analysis. BC: British Columbia RA Cohort; NOAR: Norfolk Arthritis Register; NDB: National Data Bank for Rheumatic Diseases; Sweden ERA: Sweden Early Rheumatoid Arthritis Register.

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