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. 2023 Nov 2;13:18904. doi: 10.1038/s41598-023-42474-7

Figure 4.

Figure 4

Microbial metabolic pathways inferred with PICRUSt2 that were differentially abundant in relation to smoking exposure, adjusting for age, sex and number of teeth. Heatmap of the 21 differentially abundant pathways in Current against Never smokers contrasts. Each pathway was transformed to relative abundance and Z-score scaled. Groups were ordered based on decreasing exposure to smoking, from heavier smokers to Former smokers who quit for the most years. As a reference for absence of exposure to smoking, never smokers were included in the rightmost column. Red and blue colors indicate a higher and lower mean abundance, respectively, while yellow colors indicate no difference. Differential abundance analysis was performed with a consensus-based approach of 5 differential abundance methods (DESeq2, LinDA, MaAsLin2, ALDEx2, ANCOM-BC), modeling each pathway against smoking status and adjusting for age (categorical), sex (binary) and number of teeth (categorical). Pathways reported in the figure were differentially abundant (Benjamini–Hochberg q-value < 0.05, False Discovery Rate = 5%, ALDEx2 Holm q-value < 0.05) in at least 4 methods with an absolute effect size larger than 0.5.