Classification concordance by sets of items, without 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 | ||||
| Joint pain | 90.4 | Joint pain | 89.7 | ||
| Neck, back, or low back pain | 0.44 | Neck, back, or low back pain | 0.005 | ||
| Joint swelling | Hands affected | ||||
| Morning joint stiffness | Morning joint stiffness | ||||
| Nodules | Nodules | ||||
| Rheumatoid factor positive | Rheumatoid factor positive | ||||
| Hand and wrist x rays performed | Hand and wrist x rays performed | ||||
| Back or pelvis x ray performed | Back or pelvis x ray performed | ||||
| Personal history of pain in buttocks | Family history of longlasting diarrhoea | ||||
| Family history of longlasting diarrhoea | |||||
| Spondyloarthropathy | Spondyloarthropathy | ||||
| Joint pain | 79.1 | Joint pain | 80.6 | ||
| Legs affected | 0.32 | Legs affected | 0.17 | ||
| Nodules | Nodules | ||||
| Morning back stiffness | Morning back stiffness | ||||
| More than 3 joints affected | Personal history of psoriasis | ||||
| Personal history of psoriasis | Personal history of pain in the heel | ||||
| Personal history of pain in the heel | Family history of spondylitis | ||||
| Personal history of pain in buttocks | Family history of uveitis | ||||
| Family history of spondylitis | |||||