Extended Data Fig. 3: Lower Variations of the dietary patterns within the Traveller sub-groups as compared to other Irish groups.

a, Heatmap showing the ranked median consumption levels of the five major food groups across the six Irish population groups, namely Traveller groups with a non-industrialized-like (n = 37), intermediate (n = 39) and industrialized-like (n = 41) microbiome, along with Young Non-traveller Irish (n = 85), Elderly Irish community (n = 111) and Elderly Irish Longstay (n = 53). Only those individuals with complete dietary records were included for this analysis. P-values are indicated (within the cells) for those scenarios where in the consumption of a major food group is significantly higher in a given population group with respect to all other groups. The p-values were computed using two-sided Mann–Whitney Tests corrected using Benjamini-Hochberg procedure. This heatmap shows that the variance among the Travellers is low and the main split in diet is between the Travellers and the other non-Traveller Irish. b, Boxplots showing the variation of Healthy Food Diversity index values across the six population groups. Significant P-values of the across-group pairwise comparisons (performed using the post-hoc Dunns test (two-sided) with Benjamini-Hochberg corrected FDR) are indicated. (NI-Like = Travellers with a Non-Industrialized-Like microbiome, I-Like = Travellers with an Industrialized-Like microbiome). Boxes within the boxplots denote the inter-quartile range (with the median indicated in bold) and the upper and lower whiskers extend to values that are either +1.5 X interquartile range from the third quartile (upper whisker) or to -1.5 X interquartile range from the first quartile (lower whisker).