Table 2.

Fecal microbial alpha diversity association with regional GMV by multivariable linear regression with age and sex as covariates. Alpha diversity measures included Chao1, Faith’s PD, and Shannon index. GMV regions included hippocampus, amygdala, nucleus accumbens and pericalcarine. β = standardized regression coefficient. p-value less than 0.05 are bolded. * p < 0.05. ** p < 0.01.

GMV Region	Chao1		Faith’s PD		Shannon
	β	p	β	p	β	p
Hippocampus	0.571	0.032 *	0.617	0.028 *	0.528	0.097
Amygdala	0.516	0.116	0.495	0.159	0.401	0.303
Nucleus accumbens	0.791	0.006 **	0.752	0.018 *	0.809	0.020 *
Pericalcarine (control)	−0.148	0.554	−0.256	0.328	0.173	0.549