Table 3. Mantel and partial Mantel test summary statistics.

	Mantel				Partial Mantel
	r(SA)	P	r(SG)	P	r(SA.G)	P	r(SG.A)	P
Whole community	0.516	0.0001*	−0.294	0.003*	0.509	0.0001*	−0.278	0.008*
Core group	0.504	0.0001*	−0.350	0.001*	0.499	0.0001*	−0.343	0.002*
Satellite group	−0.255	0.994	0.077	0.763	−0.249	0.992	0.050	0.687

The partial Mantel statistic r(SA.G) estimates the correlation between S (community similarity) and A (similarity in antibiotic treatments), while controlling for the effect of G (differences in CF genotype). Conversely, r(SG.A) estimates the correlation between S and G, while controlling for A. Mantel test statistics to examine the correlation between S and A or G, respectively, are given. The P-values have been calculated using the distribution of the partial Mantel or Mantel test statistic estimated from 9999 permutations. Asterisks denote those relationships that were significant at the P<0.05 level.