Table 2: Comparisons of anti-TNF studies in AS patients 
Author of Study   No. of patients   Duration of study   Active treatment   Control   Response* (active treatment vs. control)
Braun   70   12 weeks   Infliximab 5mg/kg   Placebo   BASDAI 20% improvement: 53% vs. 9%
Van der Heijde   279   18 weeks   Infliximab 5mg/kg   Placebo   ASAS20 response: 61% vs. 19%
Davis   277   24 weeks   Etanercept 25mg twice weekly   Placebo   ASAS20 response: 59% vs. 28%
* Comparisons were statistically significant