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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 3:

Comparison of Twins Discordant for Head Injury

Monozygotic Discordant Twins
(N=68 families)
Dizygotic Discordant Twins
(N=52 families)
Wave 1
Ages 9–10
Δ(Wave 5 – W1)
Ages 19–20
Wave 1
Ages 9–10
Δ(Wave 5 – W1)
Ages 19–20
μ ± SD μ (95% CI) μ ± SD μ (95% CI)
NoGo Errors
Head Injury Group
No Head Injury 44 ± 24 −33 (−40, −25) 45 ± 20 −27 (−34, −21)
Head Injury 41 ± 23 *−20 (−28, −13) 50 ± 23 −30 (−37, −24)
Reactive Aggression
Head Injury Group
No Head Injury 0.72 ± 0.33 −0.30 (−0.44, −0.15) 0.61 ± 0.35 −0.20 (−0.32, −0.08)
Head Injury 0.61 ± 0.26 −0.17 (−0.31, −0.03) 0.64 ± 0.34 −0.20 (−0.32, −0.07)
Proactive Aggression
Head Injury Group
No Head Injury 0.08 ± 0.11 −0.03 (−0.08, 0.02) 0.06 ± 0.12 −0.01 (−0.05, 0.03)
Head Injury 0.07 ± 0.13 −0.01 (−0.06, 0.04) 0.07 ± 0.12 −0.01 (−0.05, 0.03)

Note: Observed means and standard deviations presented.

μ=Mean, SD=Standard Deviation, CI=Confidence Interval

*

p-value < 0.05 for change from Wave 1 compared to No Head Injury Group.