Table 2.

Rheumatoid arthritis indicator categories for annotation

Main category	Examples
Rheumatoid arthritis	▸ Rheumatoid* (eg, rheumatoid lung, rheumatoid disease)
A diagnosis or sign of inflammatory arthritis	▸ Polyarthritis ▸ Polyarthropathy ▸ Palindromic rheumatism ▸ Rheumatic arthritis ▸ Psoriatic or gouty arthropathy ▸ Arthritis or arthropathy linked to infection
Rheumatoid factor test Test done NOS Positive result Negative result	▸ Latex test ▸ Heterophile ▸ IgA agglutination test ▸ Rose-Waaler test ▸ Rheumatoid factor level ▸ RAHA test
Referral to rheumatology	▸ Rheumatology disorder monitoring ▸ Rheumatology treatment change ▸ Rheumatology management plan given ▸ Under care of rheumatologist
Synovitis	–
DMARD prescription	▸ Separate table given for drug names
Other arthritis symptoms or diagnosis	▸ Allergic arthritis ▸ Transient arthropathy ▸ Unspecified polyarthropathy ▸ Unspecified monoarthritis ▸ Other specified arthropathy ▸ Arthritis NOS
Immune/inflammatory markers that are not specific to RA	▸ Antinuclear factor ▸ Antimitochondrial autoantibody ▸ Antismooth muscle autoantibody ▸ Parietal cell autoantibodies ▸ Autoimmune profile ▸ Antiliver kidney microsomal antibody level ▸ Plasma C reactive protein ▸ Serum C reactive protein level
Joint pain or swelling symptoms Pain Swelling/inflammation Movement/stiffness Effusion	▸ Knee pain ▸ Joint abnormal ▸ Joint swelling ▸ Reduced joint movement ▸ Joint movement painful ▸ Joint stiffness ▸ Inflammation in the joint ▸ Movement limitation ▸ Joint pain ▸ Joint effusion

*Indicates a 'wildcard' character where any term beginning with the keyword stem would be accepted for the search.

Arthritis of the MCP is a distinguishing feature of rheumatoid arthritis.

DMARD, disease-modifying antirheumatic drug; IgA, immunoglobulin A; RA, rheumatoid arthritis; MCP joint, metacarpophalangeal joints.