Table 1.

Summary of group categories

Group 1 ‘ASTIC participants’	Group 2 ‘Non-ASTIC’ participants (by choice)	Group 3 ‘Non-ASTIC participants (by external factors)’
Participated in ASTIC trial (including those unable to complete the whole trial)	Participants who did not take part in the trial because they made the decision not to participate themselves or there was another more suitable treatment option available to them	Participants who did not take part in the trial due external factors, for example, non-eligibility, lack of funding, trial halting recruitment.

ASTIC, Autologous Stem Cell Transplantation International Crohn’s disease.