Table 4.

Factor loadings for component taxa for factors from principal component analyses^a

PCA factor component	Factor loading by antibiotic use in past 6 months
	Yes	No
Factor 1
Streptococcus	51	[See factor 4]
Rothia	71	87
Neisseria	61
Gemella	76	65
Actinomyces	65	87
Veillonella	84	88
Granulicatella	85	89
Bacteroidetesb	45
Factor 2
Lactococcus	97	96
Anoxybacillus	97	94
Propionibacterium	48
Enterobacteriaceaec	89	83
Factor 3
Enhydrobacter	93	88
Moraxellaceaec	92	85
Gammaproteobacteriad	91	87
Proteobacteriab		52
Factor 4
Streptococcus	[See factor 1]	−49
Corynebacterium	79	74
Dolosigranulum		47
Haemophilus	−53	−55
Pasteurellaceaec	−56	−57
Corynebacterineaee	83	77

^aA separate PCA was performed for each antibiotic group. Factor loadings are given for all components. Note that some taxa appear as a component for one group's factor but not for the other, e.g., Neisseria is a component of factor 1 for the antibiotic “yes” group but not for the “no” group.

^bPhylum.

^cFamily.

^dClass.

^eSuborder.