Table 6.

Correlation between poor cognitive performance and presence of Alcaligeneceae and Porphyromonadaceae in the entire group

	Alcaligeneceae		Porphyromonadaceae
Cognitive Tests	R	P value	R	P value
Number connection-A, s	0.68	0.001	0.63	0.002
Number connection-B, s	0.445	0.04	0.28	0.24
Serial dotting, s	0.52	0.018	0.41	0.05
Line drawing error number	0.58	0.009	0.59	0.008
Line drawing time, s	0.24	0.31	0.17	0.48
ICT lure number	0.26	0.26	0.29	0.19
Digit symbol score	−0.63	0.003	−0.46	0.04
Block design score	−0.27	0.25	−0.21	0.37
ICT targets, %	−0.51	0.019	−0.57	0.007

A high score on digit symbol, block design, and ICT targets indicates good cognition (i.e., lower value indicates poor cognition); for the rest of the tests, a high score indicates poor cognitive performance. Significant correlations are in bold text. Therefore, we found a significant correlation between impairment on most cognitive tests and relative abundance of Alcaligeneceae and Porphyromonadaceae.