Figure 1From: Treatment options in patients with rheumatoid arthritis failing initial TNF inhibitor therapy: a critical reviewACR20 response in patients with and without prior TNF inhibitor treatment. *P = 0.028, **P < 0.0015. Data from Kristensen et al. [28]. ACR20, 20% improvement in American College of Rheumatology criteria; TNF, tumour necrosis factor.Back to article page