Table 2 Classification of patients according to the Steinbrocker criteria in the BMD <70 % of YAM and BMD ≥70 % of YAM groups
From: Risk of low bone mineral density in patients with rheumatoid arthritis treated with biologics
|  |  | BMD <70 % of YAM | BMD ≥70 % of YAM |
|---|---|---|---|
Steinbrocker classification | I | 23 | 69 |
II | 10 | 23 | |
III | 21 | 36 | |
IV | 3 | 1 |