Table 5.

Statistics for Sum Scores of Twin-Report Measures and Survey Subscales

Measure	Mean(SD)	Internal Consistency (Cronbach’s α)
Mood and emotion
Short Mood and Feelings Questionnaire	5.16 (4.44)	0.92
DASS: Depression	2.67 (3.09)	0.92
DASS: Anxiety	3.01 (2.91)	0.82
DASS: Stress	4.98 (3.42)	0.84
Anxiety Sensitivity Index	17.70 (9.52)	0.89
Affective Reactivity Index	2.65 (2.56)	0.92
Personality
EPQ-SF: Neuroticism	4.74 (3.21)	0.90
EPQ-SF: Extraversion	5.17 (2.35)	0.90
ICU	21.07 (8.90)	0.89
BIS	11.50 (4.14)	0.83
BAS (reward responsiveness)	11.21 (2.59)	0.82
BAS (drive)	5.15 (2.64)	0.82
BAS (fun-seeking)	5.91 (2.49)	0.67
Relationships
Index of Peer Relations	22.54 (14.55)	0.96
Parental Bonding Instrument (mom): Overprotection	13.15 (6.70)	0.87
Parental Bonding Instrument (mom): Care	29.21 (6.12)	0.93
Parental Bonding Instrument (dad): Overprotection	11.03 (6.84)	0.89
Parental Bonding Instrument (dad): Care	25.53 (7.95)	0.94
ECR-R: Anxiety	3.26 (1.24)	0.94
ECR-R: Avoidance	2.84 (1.08)	0.95
Multidimensional Peer Victimization Scale: Total	5.53 (6.03)	0.95

Note: DASS=Depression, Anxiety, Stress Scale-21, EPQ-SF= Eysenck Personality Questionnaire- Short Form, ECR-R=Experiences with Close Relationships-Revised, ICU=Inventory of Callous-Unemotional Traits, BIS=Behavioral Inhibition System, BAS=Behavioral Activation System