Study inclusion and exclusion criteria.
| Inclusion Criteria | Exclusion Criteria |
|---|---|
| Rheumatoid factor seropositivity | Concurrent diagnoses of |
| DAS44 ≤ 2.8 | Fibromyalgia |
| Stable dose DMARD for ≥ 1 month | Severe osteoarthritis |
| Prednisolone ≤ 10 mg/day (if taken) | Dysmenorrhea |
| NSAID used on ≥ 25/30 days per month | Planned operative intervention |
DAS44: 44-joint Disease Activity Score; DMARD: disease-modifying antirheumatic drug; NSAID: nonsteroidal antiinflammatory drug.