Classification concordance by sets of items, including self reported diagnosis, selected by logistic modelling in case-control comparisons against a standard of clinical diagnosis or classification criteria
| Clinical diagnosis | Classification criteria | ||||
|---|---|---|---|---|---|
| Selected items | Concordance (%) | Goodness of fit* (p value) | Selected items | Concordance (%) | Goodness of fit* (p value) |
| *Goodness of fit test by Hosmer-Lemeshow test (see “Patients and methods” section); a higher p value is expected to show the fit of the model to the data. | |||||
| Rheumatoid arthritis | Rheumatoid arthritis | ||||
| Self report of diagnosis | 97.7 | Self report of diagnosis | 98.5 | ||
| Morning joint stiffness | 0.953 | Morning joint stiffness | 0.946 | ||
| Rheumatoid factor test performed | More than 3 joints affected | ||||
| Hand and wrist x rays performed | Rheumatoid factor test performed | ||||
| Family history of uveitis | Hand and wrist x rays performed | ||||
| Family history of uveitis | |||||
| Personal history of psoriasis | |||||
| Spondyloarthropathy | Spondyloarthropathy | ||||
| Self report of diagnosis | 94.4 | Self report of diagnosis | 93.8 | ||
| Neck, back, or low back pain | 0.02 | Personal history of psoriasis | 0.11 | ||
| Joint swelling | |||||
| Family history of reactive arthritis | |||||