Table 2.

Mixed-Effects Model on FD

Variable	β	95% CI	P
Intercept	39.711	39.369 to 40.054	0.000
Age (in decades)	−0.158	−0.221 to −0.095	0.000
Image quality (ordinal, higher is worse)	−0.631	−0.750 to −0.512	0.000
Prevalent systemic conditions	−0.246	−0.477 to −0.015	0.037
Random effect group variance	0.187	—	—

All coefficients are in standard deviation units of FD.