. Author manuscript; available in PMC: 2023 Jan 6.

Published in final edited form as: J Neuropsychiatry Clin Neurosci. 2021 Sep 20;34(1):60–67. doi: 10.1176/appi.neuropsych.20050104

TABLE 1.

Characteristics of participants versus nonparticipants at 24 years after traumatic brain injury (TBI)

Characteristic	TBI group (N=45)		Lost to follow-up group (N=4)
	Mean	SD	Mean	SD
Age (years)	34.29	2.72	36.14	1.55^a
	N	%	N	%
Male	29	64.4	2	50
White	44	97.8	4	100
	Mean	SD	Mean	SD
Socioeconomic status^b	2.18	0.98	4.0^b	1.0
	N	%	N	%
Injury severity
Uncomplicated mild TBI	24	53	2	50
Complicated mild TBI	5	11	0	0
Moderate TBI	4	9	0	0
Severe TBI	12	27	2	50

Age for individuals lost to follow-up was calculated by designating the calendar midpoint of the long-term assessment study phase as their date of would-be participation.

In the lost-to-follow-up group, socioeconomic class data were available for three participants.