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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Twin Res Hum Genet. 2015 Jul 29;18(5):485–496. doi: 10.1017/thg.2015.46

Table 2.

Sample Characteristics

Child 1 Child 2

Mean (SD) Mean (SD)
Child Symptoms from Diagnostic Interview (MAGIC-Parent*)
 Lifetime ADHD inattentive (of 9) 2.68 (3.20) 2.32 (3.17)
 Lifetime ADHD hyperactive/impulsive (of 9) 1.42 (2.26) 1.82 (2.45)
 Lifetime ADHD total symptoms (of 18) 4.10 (4.87) 4.14 (5.11)
 Oppositional Defiant (of 8) 1.52 (1.66) 1.42 (1.65)
 Conduct Disorder (of 15) 0.38 (0.89) 0.32 (0.92)
ADHD symptoms from normative checklist (SWAN*)
 Inattention (of 9) 2.84 (2.74) 3.27 (3.06)
 Hyperactive/impulsive (of 9) 1.52 (2.11) 2.63 (2.91)
 Total (of 18) 4.36 (4.24) 5.90 (5.50)
Parent Psychopathology Diagnosis (absence/presence)^ Maternal Paternal
N % N %

 Nicotine Abuse 16 9% 14 15%
 Nicotine Dependence 104 62% 37 39%
 Alcohol Abuse 76 45% 50 53%
 Alcohol Dependence 20 12% 17 18%
 Marijuana Abuse 1 < 1% 0
 Marijuana Dependence 0 0
 Conduct Disorder 1 <1% 1 1%
 Present Oppositional Defiant Disorder (ODD) 2 1% 0
 Past ODD 3 2% 0
 Lifetime ADHD inattentive 5 3% 2 2
 Lifetime ADHD hyperactive/impulsive 1 < 1% 3 3%
 Lifetime ADHD combined type 3 2% 2 2%
 Past Depressive Episode 68 40% 1 1%
 Present Depressive Episode 8 5% 0 5
 Generalized Anxiety 12 7% 0
*

MAGIC: Missouri Assessment of Genetics Interview for Children-Parent Interview; SWAN: Strengths and Weaknesses of Attention-Deficit/Hyperactivity Disorder and Normal Behavior Scale

^

From MAGIC-Adult on Self interview