Table 1 Sample characteristics.

	Whole sample (N = 99)	Cognitively unimpaired (N = 51)	Cognitively impaired (N = 48)
	%	%	%	P-value
Female	21.2%	19.6%	22.9%	0.687
University degree	29.3%	33.3%	25.0%	0.363
Law enforcement	73.7%	80.4%	66.7%	0.121
Race/ethnicity
White	73.7%	84.3%	62.5%	0.104
Hispanic	12.1%	7.8%	16.7%
Black	10.1%	5.9%	14.6%
Other	4.0%	2.0%	6.3%
Post-traumatic stress disorder	47.5%	47.1%	47.9%	0.932

	Mean	SD	Mean	SD	Mean	SD	P-value
Age, years	56.37	5.19	56.37	4.59	56.36	5.81	0.993
SPPB Score	10.78	2.03	11.02	1.78	10.51	2.25	0.057
Gait Score	3.81	0.59	3.86	0.49	3.74	0.67	0.410
Mean walking speed, m/s	0.94	0.20	0.99	0.19	0.89	0.20	0.023
Chair Rise Score	3.17	1.12	3.31	1.10	3.02	1.13	0.078
Mean chair-rise speed, r/s	0.53	0.18	0.55	0.17	0.51	0.18	0.287
Balance Score	3.80	0.77	3.84	0.70	3.74	0.85	0.402
Maximal handgrip, lbs	56.58	17.46	58.27	16.35	54.77	18.58	0.362
Episodic memory	0.64	0.17	0.72	0.19	0.56	0.10	2.22E-06
Intraindividual response variability	0.10	0.04	0.09	0.03	0.12	0.04	3.04E-05
Response speed, r/ds	0.76	0.09	0.79	0.07	0.72	0.09	1.01E-04
Visuospatial learning	75.08	47.36	57.08	15.42	95.04	61.21	1.55E-04
Visuospatial memory	13.28	9.09	9.47	4.33	17.50	10.99	2.03E-05
Processing speed, r/ds	0.63	0.05	0.65	0.04	0.61	0.06	2.67E-04
Attention	1.36	0.20	1.43	0.14	1.28	0.22	1.71E-04
Visual memory	0.95	0.12	0.99	0.12	0.91	0.10	3.27E-04
Throughput	0.32	0.04	0.33	0.04	0.30	0.03	3.55E-05
Intracranial volume, cm³	1578.50	147.00	1583.26	128.25	1573.44	165.86	0.744
Cerebellar cortical thickness, mm	5.00	0.29	5.08	0.00	4.91	0.00	0.002
Cerebellar asymmetry, %	−0.32	1.33	−0.43	0.27	−0.20	0.29	0.406

P-values determined using Welch’s t-test and tests of proportions to compare CU to CI group.
CU cognitively unimpaired, CI cognitively impaired, SPBB Short Physical Performance Battery, IRV intraindividual response variability, SD standard deviation, cm centimeter, mm millimeter, lbs pounds.

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