Table 1. Reasons for exclusion of potentially eligible papers that were considered for the dietary intervention in IBS systematic review.

Reference	Randomized	Design	Dietary intervention	Control	IBS symptoms assessed	Dichotomous data extractable	≥7 Days therapy
King et al.13	Yes	Crossover	Exclusion diet	Yes	Yes	No	Yes
Ong et al.14	Yes	Crossover	Low FODMAPs diet	Yes	Yes	No	No
Bentley et al.15	Yes	Crossover	Exclusion diet after sensitivity testing	Yes	Yes	No	Unclear
Carroccio et al.16	Yes	Crossover	Empirical exclusion diet followed by sensitivity testing	Unclear	Yes	No	Yes
Shepherd et al.17	Yes	Crossover	Low FODMAPs	Yes	Yes	No	Yes
Vazquez Roque et al.18	Yes	Parallel	Gluten-free diet	Yes	No	No	Yes
Halmos et al.19	Yes	Crossover	Low FODMAPs	Yes	Yes	No	Yes
Biesiekierski et al.20	Yes	Crossover	Rechallenge of gluten after low FODMAPs diet	Yes	Yes	No	No
Berg et al.21	Yes	Parallel	Fructose-reducing diet	“IBS diet”—unclear if this is another active therapy	Yes	No	Yes
Jones et al.22	Yes	Crossover	Food rechallenge in food elimination responders	Yes	Yes	No	No
Carroccio et al.23	No	No	Gluten challenge in wheat-sensitive patients	No	No	No	Yes
Lunardi et al.24	Yes	Crossover	Oral chromoglycate in food-intolerant IBS patients—not an eligible intervention	Yes	Yes	No	Yes
Stefanini et al.25	Yes	Parallel	Empirical food elimination diet	Sodium chromoglygate—not an eligible control	Yes	Yes	Yes
Piccinini et al.26 a	Yes	Parallel	Empirical food elimination diet	Sodium chromoglygate—not an eligible control	Yes	Yes	Yes

FODMAPs, Fermentable Oligo-Di-Monosaccharides and Polyols; IBS, irritable bowel syndrome.

^aPossible duplicate paper as design similar, but intervention was for 3 weeks rather than 4 weeks.