1. Morning stiffness
Morning stiffness in and around the joints lasting at least 1 hour.
2. Arthritis in three or more joint areas
Arthritis in three or more joint areas, involving the PIP, MCP, wrist,
elbow, knee, ankle or MTP joints on the right or left
Soft-tissue swelling or fluid (but not bony overgrowth) observed by a
physician, present simultaneously for at least 6 weeks
4. Symmetrical arthritis
Simultaneous involvement of the same joint areas (defined in 2 above)
on both sides of the body (bilateral involvement of PIP, MCP or MTP
joints is acceptable without absolute symmetry) for at least 6 weeks
5. Rheumatoid nodules
Subcutaneous nodules over bony prominences, extensor surfaces or in
juxta-articular regions, observed by a physician.