Table 1.

Bacterial community composition in hands changed after exposure to plant and soil based materials (experiment 1)

	PERMANOVA									PERMDISP
	p‐value			F			r 2			p‐value	F	Mean bef	Mean aft
	Bef/Aft	Person	Interact.	Bef/Aft	Person	Interact.	Bef/Aft	Person	Interact.
Taxonomic levels
Phylum	0.001	0.006	0.017	19.88	8.34	5.38	0.32	0.14	0.09	0.501	0.53	0.19	0.16
Class	0.001	0.004	0.055	18.32	6.29	2.65	0.33	0.11	0.05	0.197	1.74	0.20	0.25
Order	0.001	0.009	0.093	18.31	4.92	2.03	0.34	0.09	0.04	0.012	7.01	0.21	0.32
Family	0.001	0.001	0.093	14.80	5.81	2.08	0.29	0.11	0.04	0.035	4.60	0.30	0.41
Genus	0.001	0.003	0.086	13.22	5.65	1.89	0.27	0.12	0.04	0.029	5.42	0.32	0.44
OTU	0.001	0.002	0.085	8..68	5.55	1.78	0.20	0.13	0.04	0.001	11.74	0.34	0.51
OTU level within Phyla/Class
Actinobacteria	0.001	0.001	0.011	9.63	7.39	2.97	0.20	0.15	0.06	0.02	6.77	0.38	0.49
Bacteroidetes	0.001	0.007	0.524	2.21	1.69	0.95	0.07	0.05	0.03	0.145	2.18	0.63	0.67
Firmicutes	0.009	0.005	0.394	4.36	4.83	0.90	0.11	0.13	0.02	0.048	4.55	0.30	0.45
Proteobacteria	0.001	0.023	0.536	8.45	3.18	0.77	0.21	0.08	0.02	0.006	8.32	0.31	0.49
Alphaproteobacteria	0.001	0.693	0.861	9.10	0.71	0.59	0.24	0.02	0.02	0.944	0.01	0.49	0.49
Betaproteobacteria	0.001	0.003	0.473	4.48	2.53	0.95	0.12	0.07	0.03	0.745	0.11	0.59	0.57
Gammaproteobacteria	0.002	0.009	0.492	4.34	3.71	0.86	0.12	0.10	0.02	0.006	9.50	0.29	0.51

Results of permutational multivariate analysis of variance (PERMANOVA) with two factors (before/after, study person and their interaction) and results of the analysis of multivariate homogeneity of group dispersions (PERMDISP). Bray‐Curtis dissimilarity was used. Analyses were not done for phylum Acidobacteria and class Deltaproteobacteria because several samples did not include any bacteria belonging to these two taxa. For PERMDISP, also the mean values for the distances to group medians are shown. Each of the sixteen materials was tested once by one of the two study participants. P‐values less than 0.05 are highlighted in bold.