Table 1.

Sample characteristics: AHA exercise groups.

	CSF		PET-PIB		Cognitive
	Low Exercise	High Exercise	Low Exercise	High Exercise	Low Exercise	High Exercise
N	62	33	122	59	211	116
Age (M, SD)	62±8	64±7	67±10	68±8	72±8	72±8
Sex (F/M)	43/19	18/15	85/37	33/26	136/75	64/52
Education (M, SD)	16±3	17±3	16±3	16±3	16±3	15±3
Health composite (M, SD)	1.2±1.0	.8±.9*	1±1	1±1	1±1	1±1
APOE ε4 (−/+)	37/25	24/9	85/37	40/19	134/77	83/33
BDNF met (−/+)	42/20	19/14	71/44	36/18	130/70	73/30
Number follow-ups (M, SD)	1.44±0.55	1.41±0.50	1.42±0.61	1.58±0.77	3.60±2.15	3.56±2.10
Follow-up length, years (M, SD)	3.28±1.45	3.66±1.12	3.74±2.40	4.23±2.47	6.09±2.28	6.01±2.19

Notes. BDNF genotype data was missing for 12 participants for the PET-PIB sample and 24 for the Cognitive sample. The BDNF subsamples were not significantly different from the APOE samples (all p’s > .59). Processing speed composite data were missing for 2 participants. Baseline exercise occurred within 5.33 years (M=1.36, SD=1.22) of baseline CSF, within 7.25 years (M=1.74, SD=1.81) years of PET-PIB, and within 7.87 years (M=1.22, SD=1.00) of Cognitive assessment. Continuous variables were compared using t-tests and categorical variables were compared using a chi-square test.

^*= p<.05.