Table 2.

Characteristics of excluded studies

Study	Year	Reasons for exclusion
Seidman et al.	1991	abstract only
Seidman et al.	1993	abstract only
Thomas et al.	1992	wrong outcome
Thomas et al.	1993	no patient level data
Breese et al.	1995	poor classification of steroid exposre
Terrin et al.	2002	poor drug classification, no information on disease distribution
Ruuska et al.	1994	wrong outcome, no discussion of randomization
Soo et al.	2013	80% of EEN group on AZA and 64% on 5-ASA, not a clean comparison of EEN vs. CS
Saadah et al.	2012	combines data from EEN and CS arm, not a true comparator two armed study
Gorard et al.	2003	adult population
Mesker et al.	2009	no EN only comparator arm
Zhu et al.	2013	adult population
Hartmann et al.	2008	no EN only comparator arm
Sigall-Boneh et al.	2014	no non-diet treatment arm
Workman et al.	1984	no non-diet treatment arm
Harries et al.	1983	adult population
Riordan et al.	1993	adult population
Matsumoto et al.	2005	no EN only comparator arm, adult population

AZA, azathioprine; 5-ASA, mesalamine; EEN, exclusive enteral nutrition; EN, Enteral Nutrition; CS, corticosteroids