Efficacy of azathioprine versus mesalazine in postoperative Crohn's disease–The Authors' response

We thank Dr Ford for his comments1 on our recent paper in Gut entitled ‘Azathioprine versus mesalazine for prevention of postoperative clinical recurrence in patients with Crohn's disease with endoscopic recurrence: efficacy and safety results of a randomised, double-blind, double-dummy multi-centre trial’.2 With regard to our power calculation assuming a difference in treatment effect of 35% in favour of azathioprine, although two previous …