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Dummy variables definition for predisposing factors of misdiagnosis
| Causes of ONFH | Corticosteroids | Alcohol | Trauma | Others |
|---|---|---|---|---|
| x1 | 1 | 2 | 3 | 4 |
| x1 (1) | 1 | 0 | 0 | 0 |
| x1 (2) | 0 | 1 | 0 | 0 |
| x1 (3) | 0 | 0 | 1 | 0 |
| Type of Imaging examination at the initial visit | X‐ray | CT | MRI | ≥2 types |
|---|---|---|---|---|
| x6 | 1 | 2 | 3 | 4 |
| x6 (1) | 1 | 0 | 0 | 0 |
| x6 (2) | 0 | 1 | 0 | 0 |
| x6 (3) | 0 | 0 | 1 | 0 |
CT, computer tomography; MRI, magnetic resonance imaging; ONFH, osteonecrosis of femoral head.
