Table 1.

Demographics for each hierarchical regression model

Dataset	Brain structure	Cognition	N	Mean age (SD, range)	Sex (M/F)
TILDA	Grey matter volume, hippocampal volume	Verb Flu, Proc Speed, Epi Mem	313	68.90 (6.75, 54–88)	155/158
	Grey matter volume, hippocampal volume	Exec Func, Glob Cog	311	68.91 (6.77, 54–88)	154/157
	Mean cortical thickness	Verb Flu, Proc Speed, Epi Mem	279	69.16 (6.64, 54–88)	137/142
	Mean cortical thickness	Exec Func, Glob Cog	277	69.18 (6.66, 54–88)	136/141
CR/RANN	All	All	234	64.49 (7.42, 50–80)	114/120

SD standard deviation, M male, F female, Verb Flu verbal fluency, Proc Speed processing speed, Epi Mem episodic memory, Exec Func executive function, Glob Cog global cognition