ADA-positive (>12 AU/mL) | ADA-negative (≤12 AU/mL) | Total | |
MTX+ | 13 (25.0) | 39 (75.0) | 52 |
MTX− | 26 (47.3) | 29 (52.7) | 55 |
Total | 39 (36.4) | 68 (63.6) | 107 |
ADA-high (>100 AU/mL) | ADA-low (13–100 AU/mL) | ADA-negative (≤ 12 AU/mL) | Total | |
MTX+ | 3 (5.8) | 14 (26.9) | 35 (67.3) | 52 |
MTX− | 10 (18.2) | 19 (34.5) | 26 (47.3) | 55 |
Total | 13 (12.2) | 33 (30.8) | 61 (57.0) | 107 |
Comparison of ADA+ in MTX+ and MTX− groups: p=0.03
ADA, anti-drug antibodies; MTX+, methotrexate+adalimumab; MTX−, adalimumab alone.