1
APPENDIX A
Psychometric Properties of Self-Report Scales
Triarchic Psychopathy Measure (TriPM). Internal consistencies as measured by
Cronbach’s alpha were acceptably high for TriPM total scores (α = .85), as well as for each
TriPM subscale (αs for Boldness, Meanness, and Disinhibition = .79, .83, and .79, respectively).
NEO-PI-R Antagonism. In the current study, only the 48 items of the Agreeableness
scale of the NEO-PI-R were administered. Items were reverse-scored using a 5-point Likert scale
ranging from 1 (“strongly agree”) to 5 (strongly disagree) such that higher scores indicated
higher Antagonism. The internal consistency of total antagonism scores was high (α = .89 in the
current sample). Internal consistencies for the six lower-order facets in the current sample ranged
from α = .51 (Tendermindedness) to α = .79 (Trust). All of the facets were significantly
intercorrelated (rs= .17 - .46).
35-item Multidimensional Personality Questionnaire (MPQ-35). Items were scored
using a 4-point Likert scale, which ranged from 1 (“Strongly disagree”) to 4 (“Strongly agree”).
Internal consistencies for the 10 trait scales (3-4 items each) in the current sample ranged from α
= .49 (Traditionalism) to α = .74 (Control). Correlations among the 10 trait scales varied from r
=.01 (for Stress Reaction with Control) to r = .44 (for Social Closeness with Wellbeing).
Psychopathic Personality Inventory (PPI). Items are scored using a 4-point Likert scale
(1= False to 4 = True). Within the current sample, internal consistencies of individual PPI
subscales as measured by coefficient alpha ranged from .79 (Coldheartedness) to .88
(Fearlessness). Correlations amongst the 8 subscales of the PPI within the current sample ranged
2
from r = -.02 (for Stress Immunity with Machiavellian Egocentricity) to r = .50 (for Fearlessness
with Impulsive Nonconformity).
Self-Report Psychopathy Scale-III (SRP-III). Items are scored using a 5-point Likert
scale ranging from 1 (disagree strongly) to 5 (agree strongly). Within the current sample, internal
consistency of the SRP-III total psychopathy score was high (α = .93), with coefficient alpha
ranging from .76-.86 for SRP-III subscales (Callous Affectα = .76; Interpersonal Manipulation α
= .86; Erratic Lifestyle α = .84; and Criminal Tendencies α = .82). The subscales of the SRP-III
were moderately to highly intercorrelated in the present sample, ranging from r = .43 (for Erratic
Lifestyle with Criminal Tendencies) to r = .63 (for Callous Affect with Interpersonal
Manipulation).
Levenson's Self-Report Psychopathy Scale (LSRP). Items are scored using a 5-point
Likert scale ranging from 1 (Strongly Disagree) to 5 (Strongly Agree). Internal consistency for
the LSRP total score was .84, whereas coefficient alphas was somewhat lower for the Primary (α
= .83) and Secondary (α = .68) subscales. In the present sample, the LSRP Primary and
Secondary scales were moderately correlated (r = .42).
Youth Psychopathic Traits Inventory (YPI). Items are scored using a 4-point Likert
scale, ranging from 1 (“does not apply at all”) to 4 (“applies very well”). Internal consistency for
overall psychopathy scores on the YPI was very high (α = .93 in the current sample). Internal
consistency reliabilities for the Grandiose-Manipulative, Callous-Unemotional, and ImpulsiveIrresponsible broad factors in the current sample were high (αs= .90, .85, and .82, respectively),
with reliabilities for the 10 subscales also acceptable (α range = .66 to .83). The three factors
were moderately intercorrelated (rs = .39 - .58).
3
Child Psychopathy Scale (CPS). Participants are instructed to indicate the degree to
which items are true of them by responding either No (0) or Yes (1). Responses on the CPS yield
a total psychopathy score (α = .80 in the current sample) and scores on 13 subscales, each
composed of 2 to 7 items. Within the current study sample, the internal consistency of the CPS
subscales ranged from α = .27 (Lack of Guilt; 3 items) to α = .74 (Behavioral Dyscontrol; 3
items). Correlations among the 13 CPS subscales in the current sample ranged from r = -.05 (for
Lack of Guilt with Behavioral Dyscontrol) to r = .56 (for Unreliability with Parasitic Lifestyle).
Antisocial Process Screening Device (APSD). Items are scored using a 3-point Likert
scale ranging from 0 (“not true at all”) to 2 (“definitely true”). Responses on the APSD selfreport measure yield a total psychopathy score (α = .78 in the current sample) and scores on two
Factors, Callous/Unemotionality (CU; α = .51) and Impulsivity/Conduct Problems (I/CP), with
the latter divisible into Narcissism (α = .67) and Impulsivity (α = .62) subfactors. Within the
current study sample, correlations amongst the 3 component dimensions of the APSD varied
from r = .23 (for Callous-Unemotionality with Impulsivity) to r = .37 (for Impulsivity with
Narcissism).
Inventory of Callous-Unemotional Traits (ICU). Items are scored using a 4-point Likert
scale ranging from 0 (“not at all true”) to 3 (“definitely true”). In the current study sample, the
internal consistency for ICU total scores was .84, with coefficient alphas somewhat lower for the
four facet scores: Careless (α = .75), Unemotional (α = .82), Callous (α = .53), and Uncaring (α =
.71). Correlations amongst the 4 facets of the ICU in the current sample varied from r = .11 (for
Careless with Unemotional) to r = .60 (for Callous with Uncaring).
4
APPENDIX B
Descriptive Statistics
Triarchic Psychopathy Measure
TriPM Total
Boldness
Meanness
Disinhibition
NEO-PI-R Antagonism
Antagonism Total Score
(lack of) Trust
(lack of) Straightforwardness
(lack of) Altruism
(lack of) Compliance
(lack of) Modesty
(lack of) Tendermindedness
Multidimensional Personality Questionnaire (35-item)
Social Potency
Wellbeing
Stress Reaction
Achievement
Harm Avoidance
Social Closeness
Aggression
Alienation
Control
Traditionalism
Psychopathic Personality Inventory
PPI Total Score
PPI-FD
Social Potency
Fearlessness
Stress Immunity
PPI-IA
Machiavellian Egocentricity
Impulsive Nonconformity
Alienation
Carefree Nonplanfulness
Coldheartedness
Self-Report Psychopathy Scale-III
Mean
SD
120.10
52.70
32.19
35.13
15.67
7.56
7.87
7.44
121.66
21.16
20.06
15.61
22.87
21.70
20.27
19.16
5.27
4.88
4.27
4.95
4.89
3.81
9.40
5.25
7.80
7.57
4.72
7.23
12.88
9.33
5.35
7.74
2.46
1.80
2.41
2.26
1.75
2.64
2.67
2.00
1.83
1.99
318.88
136.09
62.44
46.38
29.71
143.97
63.62
10.95
35.41
36.42
43.62
57.11
25.03
10.92
10.93
5.99
26.83
12.04
2.83
8.97
7.17
8.21
5
SRP-III Total Score
Interpersonal Manipulation
Callous Affect
Erratic Life Style
Criminal Tendencies
Levenson Self-Report Psychopathy Scale
LSRP Total
Primary
Secondary
Youth Psychopathic Traits Inventory
YPI Total
Grandiose Manipulation Factor
Dishonest Charm
Grandiosity
Lying
Manipulation
Callous/Unemotional Factor
Callousness
Remorselessness
Unemotionality
Impulsive/Irresponsible Factor
Thrill-Seeking
Impulsiveness
Irresponsibility
Child Psychopathy Scale
CPS Total Score
Glibness
Lack of Guilt
Poverty of Affect
Manipulation
Callousness
Untruthfulness
Parasitic Lifestyle
Behavioral Dyscontrol
Unreliability
Failure to Accept Responsibility
Lack of Planning
Impulsiveness
Boredom Susceptibility
Antisocial Process Screening Device
APSD Total Score
143.02
39.56
38.02
42.50
23.76
29.88
9.74
7.99
10.24
8.31
59.20
29.82
19.17
6.53
7.01
4.27
102.49
40.11
10.86
10.49
9.15
9.84
29.27
9.46
8.97
10.88
33.33
13.38
10.95
9.02
19.97
9.93
3.25
2.72
3.02
3.16
6.94
2.67
2.72
2.87
6.81
2.76
2.83
2.93
85.62
6.27
5.06
12.15
5.19
7.48
8.45
7.46
4.65
5.71
5.13
5.60
5.10
7.78
10.06
1.23
0.70
1.47
0.95
0.94
1.36
0.92
1.23
0.69
0.88
0.74
0.79
1.54
31.01
5.11
6
Narcissism
Callous-Unemotionality
Impulsivity
Inventory of Callous-Unemotional Traits
ICU Total Score
Unemotional
Callous
Uncaring
10.49
8.78
8.67
2.27
1.79
1.95
43.23
12.03
12.19
14.85
8.43
3.48
3.54
3.79