Table 1 Variables generated by Croft scoring and the OARSI atlas, with additional derived variables
Variable | Grading | Variable used in the analysis |
|---|---|---|
Osteoarthritis (Croft score) | 0–5 | Progressive OA: Croft score > 3 at baseline and an increase in score at follow-up Incident OA: Croft score < 3 at baseline and > 3 at follow-up |
Osteophytes | Change in osteophyte score: sum of all semi-quantitative osteophyte grades at follow-up minus their sum at baseline | |
 Superior femoral | 0–3 | |
 inferior femoral | 0–3 | |
 Superior acetabular | 0–3 | |
 inferior acetabular | 0, 1 | |
JSN | Change in JSN score: sum of both superior and medial semi-quantitative JSN grades at follow-up minus this sum at baseline | |
 Superior | 0–3 | |
 Medial | 0–3 | |