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. Author manuscript; available in PMC: 2020 Nov 1.
Published in final edited form as: Neuropsychology. 2019 Jul 1;33(8):1035–1044. doi: 10.1037/neu0000570

Table 1:

Descriptive Statistics: Demographics and Head Injury

No Head Injury N = 689 Early Head Injury N = 95 Late Head Injury N = 96 p-value
Age at Wave 1 (years) 9.6 ± 0.6 9.5 ± 0.5 9.8 ± 0.7 0.014
Male 43% 55% 59% 0.001
Monozygotic 46% 42% 41% 0.519
Race 0.072
 White 30% 21% 28%
 Hispanic 35% 43% 46%
 Black 14% 17% 7%
 Asian 4% 5% 0%
 Mixed/Other 17% 14% 19%
Age at First Head Injury (years) 4.2 ± 2.1 14.7 ± 3.4 <0.001
Multiple Head Injuries 33% 26% <0.001
Taken to Hospital 80% 62% 0.008
Lost Consciousness 19% 57% <0.001