Table 3.

Summary of Sample Characteristics and Related Structure-Cognition Findings in Older Adults

	All Reviewed Studies (N=50)		Studies with Findings Specific to Older Adults (N=35)		Structure – Cognition Relationships in Older Adults (# of Positive/Negative/Null Findings)*
Sample Size	Median	Range	Median	Range	Small Sample Size	Large Sample Size †
	58.5	9 – 511	48	9 – 511	15/6/27	29/1/23
Design	Cross-Sectional	Longitudinal	Cross-Sectional	Longitudinal	Cross-Sectional	Longitudinal
	39	11	27	8	34/7/39	10/0/11
Age	Median of Means	Overall Age Range	Median of Means	Overall Age Range	Lower Mean Age	Higher Mean Age †
	62.5	18 – 99	72.0	18 – 99	21/1/24	18/6/21
Education Years	Median of Means	Range of Means	Median of Means	Range of Means	Lower Mean Education	Higher Mean Education †
	15.1	8.2 – 16.7	14.6	8.2 – 16.7	23/1/15	10/6/21
Gender % female	Median	Range	Median	Range	Lower % Female	Higher % Female †
	56.5	0 – 100	56.6	0 – 100	24/4/15	11/3/24

^*Findings of the association between CSF and cognition not included

^†Divisions based on median split