TABLE 3.

Predictors of Novel Psychiatric Disorder (NPD) in the Interval 6–12 Months After Mild Traumatic Brain Injury (MTBI)

	NPD (N=17)	No NPD (N=43)	t	[df]	p	Effect Size
Demographic Variables
Age at injury, years	9.20 (2.62)	10.01 (2.94)	1.00	[58]	NS	0.29
Gender: boys N (%)c	11 (65%)	29 (67%)			NS
Socioeconomic Status	33.25 (11.40) N=16	40.56 (11.86)	2.13	[57]	0.038	0.63
Raceb				[4]	NS
Caucasian	9	30
African-American	1	6
Hispanic	5	6
Asian	2	0
Other	0	1
Psychosocial Variables
Pre-injury lifetime psychiatric disorder, N (%)c	7 (41%)	16 (37%)			NS
Pre-injury Vineland ABC Standard Score	89.88 (17.25) N=16	95.45 (13.73) N=40	1.27	[54]	NS	0.36
Pre-injury Family Functioning	1.77 (0.41) N=16	1.53 (0.43) N=41	−1.96	[55]	0.055	0.57
Family Psychiatric History	1.47 (1.06) N=15	0.97 (1.07) N=37	−1.52	[50]	NS	0.47
Pre-injury Psychosocial Adversity	1.13 (1.02) N=16	0.60 (0.82)	−2.02	[57]	0.048	0.57
Injury Variables
Lowest Glasgow Coma Scale Score (GCS)a				[2]	NS
Glasgow Coma Scale score: 13; N	2	3
Glasgow Coma Scale score: 14; N	5	11
Glasgow Coma Scale score: 15; N	10	29
Abnormal CT scanc	5/15 (33%)	16/41 (39%)			NS
Depressed skull fracturec	1/17 (6%)	6/43 (14%)			NS
Abbreviated Injury Scale: Injury Severity Score (extracranial)	2.7 (6.9)	1.3 (2.7)	−0.80	[15.6]	NS	0.27

Values are mean (standard deviation) except where indicated. Effect size refers to Cohen’s d.

ABC: Adaptive Behavior Composite.

^aPearson χ²=0.54.

^bPearson χ²=8.25.

^cFisher’s exact test.