. Author manuscript; available in PMC: 2016 Feb 14.

Published in final edited form as: J Alzheimers Dis. 2015;47(4):985–993. doi: 10.3233/JAD-143207

Table 2.

Prevalence of TBI in NACC-database groups

	EOAD	EOAD-matched NC	LOAD	LOAD-matched NC
No previous TBI	1234 (85.2%)	1279 (88.3%)	3954 (91.2%)	3931 (90.6%)
Any TBI^*	193 (13.3%)	161 (11.1%)	335 (7.7%)	379 (8.7%)
Insufficient information on TBI	22 (1.5%)	9 (0.6%)	48 (1.1%)	27 (0.6%)

Trend toward significance for EOAD versus EOAD-matched controls: χ² = 3.64, p = 0.056. TBI, traumatic brain injury; EOAD, early-onset Alzheimer’s disease; LOAD, late-onset Alzheimer’s disease; NC, normal controls.