Additional file 6.

Bifidobacterium genus abundance decreases significantly with age. The association of Bifidobacterium abundance with disease status and clinical metadata (including age) was determined to be significant in these data using a sparse general linear model. Clade abundances were transformed with the arcsine square-root transformation for proportional data (y-axis). Size of effect, standard deviation, P-value (p) and Benjamini and Hochberg false discovery rate (q) are shown in parentheses, and the line of best fit in green.

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Morgan et al. Genome Biology 2012 13:R79   doi:10.1186/gb-2012-13-9-r79