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Journal of Consulting and Clinical Psychology
Copyright 2008 by the American Psychological Association
2008, Vol. 76, No. 1, 22–27
0022-006X/08/$12.00 DOI: 10.1037/0022-006X.76.1.22
Identifying Clinically Distinct Subgroups of Self-Injurers Among Young
Adults: A Latent Class Analysis
E. David Klonsky and Thomas M. Olino
Stony Brook University
High rates of nonsuicidal self-injury (NSSI; 14%–17%) in adolescents and young adults suggest that
some self-injurers may exhibit more or different psychiatric problems than others. In the present study,
the authors utilized a latent class analysis to identify clinically distinct subgroups of self-injurers.
Participants were 205 young adults with a history of 1 or more NSSI behaviors. Latent classes were
identified on the basis of method (e.g., cutting vs. biting vs. burning), descriptive features (e.g.,
self-injuring alone or with others), and functions (i.e., social vs. automatic). The analysis yielded 4
subgroups of self-injurers, which were then compared on measures of depression, anxiety, borderline
personality disorder, and suicidality. Almost 80% of participants belonged to 1 of 2 latent classes
characterized by fewer or less severe NSSI behaviors and fewer clinical symptoms. A 3rd class (11% of
participants) performed a variety of NSSI behaviors, endorsed both social and automatic functions, and
was characterized by high anxiety. A 4th class (11% of participants) cut themselves in private, in the
service of automatic functions, and was characterized by high suicidality. Clinical and research impli-
cations are discussed.
Keywords:
self-injury, self-mutilation, self-harm, latent class analysis, borderline personality disorder
Nonsuicidal self-injury (NSSI) refers to the intentional and
direct injuring of one’s own body tissue without suicidal intent.
NSSI is listed as a symptom of borderline personality disorder
(BPD) by the
Diagnostic and Statistical Manual of Mental Disor-
ders
(4th ed.;
DSM–IV
; American Psychiatric Association, 1994)
but can also be found in individuals without BPD. Approximately
4% of the U.S. adult population reports a history of NSSI (Briere
& Gil, 1998; Klonsky, Oltmanns, & Turkheimer, 2003). Individ-
uals who engage in NSSI are more likely to experience psychiatric
problems—such as depression, anxiety, and suicidality—as well as
features of borderline and other personality disorders (Andover,
Pepper, Ryabchenko, Orrico, & Gibb, 2005; Klonsky et al., 2003;
Whitlock, Eckenrode, & Silverman, 2006). Thus, NSSI often re-
quires aggressive treatment.
In comparison with adult populations, NSSI appears to be more
common in adolescents and young adults. Approximately 14% of
adolescents (Ross & Heath, 2002) and 17% of young adults
(Whitlock et al., 2006) report a history of one or more NSSI
behaviors. These high rates suggest that NSSI does not have the
same clinical implications in all cases. Indeed, a study of adoles-
cent inpatients found considerable diagnostic heterogeneity, in-
cluding that 12% did not meet criteria for a mental disorder (Nock,
Joiner, Gordon, Lloyd-Richardson, & Prinstein, 2006). It would be
useful, then, to investigate large, nonclinical samples of adolescent
and young adults and to clarify how many and which self-injurers
are likely to have severe psychopathology and require aggressive
treatment.
To help explain psychiatric heterogeneity in NSSI, a few re-
searchers have related different manifestations of NSSI to different
psychiatric presentations. Andover et al. (2005) found that psychi-
atric symptoms differed by method of NSSI. Specifically, young
adults who utilized skin cutting were found to report more symp-
toms of anxiety than those who performed other forms of NSSI.
Nock and Prinstein (2005) examined the functions of NSSI in
relation to clinical presentation. Adolescents endorsing automatic
functions (e.g., to stop bad feelings, to feel relaxed) were more
likely to have made a recent suicide attempt, feel hopeless, and
endorse symptoms of posttraumatic stress disorder. Contextual
variables may also be relevant for determining clinical implica-
tions of NSSI. For example, Nock et al. (2006) found that utilizing
a greater variety of NSSI methods and experiencing less pain
during NSSI were both associated with a history of attempted
suicide.
On the basis of the studies described, we hypothesized that
clinically distinct subgroups of self-injurers could be identified on
the basis of NSSI method, function, and contextual features. In the
present study, we applied a latent class analysis (LCA) to test this
hypothesis. LCA is a method of classifying individuals from a
heterogeneous population into smaller, relatively homogenous un-
observed subgroups (B. Muth´n & Muth´n, 2000). Detailed infor-
mation on the phenomenology and functions of NSSI was obtained
from a large sample of young adults reporting NSSI. These data
were entered into an LCA, and the resultant classes were compared
on key clinical variables, including depression, anxiety, BPD
symptoms, and suicidal behavior.
E. David Klonsky and Thomas M. Olino, Department of Psychology,
Stony Brook University.
This work was supported in part by a grant from the American Foun-
dation for Suicide Prevention and by the Office of the Vice President of
Research at Stony Brook University.
Correspondence concerning this article should be addressed to E. David
Klonsky, Department of Psychology, Stony Brook University, Stony
Brook, NY 11794-2500. E-mail: E.David.Klonsky@stonybrook.edu
22
SPECIAL SECTION: SELF-INJURY LCA
23
Method
college students. Internal consistency of the 12 NSSI behaviors
was excellent (
.84). Item-total correlations for the behaviors
ranged from .22 (swallowing chemicals) to .60 (banging/hitting
self), with a median of .52. One-to-four week test–retest reliability
was examined in a subsample of 59 college students. Test–retest
reliability of the omnibus NSSI scale was .85. Spearman correla-
tions between Time 1 and Time 2 reports of lifetime frequency of
NSSI behaviors ranged from .54 (pinching) to .94 (interfering with
wound healing), with a median of .74 indicating good reliability.
To examine construct validity, we correlated the total NSSI score
with each item on the MSI-BPD, the total MSI-BPD scale omitting
the suicide/self-harm item, and lifetime suicide ideation and at-
tempts as measured by items from the YRBS. As predicted, the
NSSI total score correlated more highly with the suicide/self-harm
item (
r
.45) than with any other MSI-BPD item (median
r
.21). Also as predicted, the total NSSI score exhibited a moderate
correlation with the MSI-BPD scale (the suicide/self-harm item
was omitted;
r
.37), as well as with suicide ideation (
r
.38)
and attempted suicide (
r
.28). All correlations were statistically
significant at an alpha level of .001.
Functions of NSSI.
A recent empirical review has noted that
the field lacks a comprehensive measure of NSSI functions (Klon-
sky, 2007). The Inventory of Statements about Self-Injury was
developed on the basis of this review and used in the present study.
Items equivalent or similar to items used in previous studies were
pooled to measure a variety of functions. The functions assessed in
the present study were as follows: (a) affect regulation, (b) self-
punishment, (c) anti-dissociation, (d) anti-suicide, (e) interpersonal
influence, (f) peer bonding, (g) sensation seeking, and (h) inter-
personal boundaries. These functions are described in Klonsky’s
(2007) study.
Each function on the Inventory of Statements about Self-Injury
is assessed by three items. Participants rate how well items com-
plete the phrase: “When I harm myself, I am ....”Examples of
items and the functions they assess are as follows: “calming myself
down” (affect regulation), “punishing myself” (self-punishment),
“seeking care or help from others” (interpersonal influence), and
“fitting in with others” (peer bonding). Participants rate each item
on a 3-point scale as
very relevant
,
somewhat relevant
,or
not
relevant
. The questionnaire takes approximately 8 min to com-
plete.
An exploratory factor analysis with promax rotation revealed
two superordinate factors that were consistent with previous re-
search (Nock & Prinstein, 2004). The first factor (eigenvalue
3.5) represented socially reinforcing functions (interpersonal in-
fluence, peer bonding, sensation seeking, and interpersonal bound-
aries). The second factor (eigenvalue
1.4) represented automat-
ically reinforcing functions (affect regulation, self-punishment,
anti-suicide, and anti-dissociation). These were the only two fac-
tors with eigenvalues greater than one. Inspection of the scree plot
also indicated that two factors should be retained. The two-factor
solution accounted for 61% of the variance. Additional data on this
instrument’s psychometric properties are being prepared for pub-
lication (Glenn & Klonsky, 2007).
Participants and Procedure
Participants were 205 college students who endorsed at least one
NSSI behavior on a mass screening administered to 815 students in
introductory psychology courses. That approximately 1 in 4 par-
ticipants endorsed NSSI is comparable with previous research on
college students (Whitlock et al., 2006). Other measures included
in this study were also completed at this time. All participants
received course credit, provided informed consent, and had the
option of completing an alternative assignment for equivalent
credit. The solicitation of participants did not mention NSSI or
psychopathology; thus, systematic differences on key study vari-
ables between participants and potential participants opting not to
complete the mass testing are unlikely. A comparison of study
participants to 115 potential participants who skipped the mass
screening yielded no significant differences in rates or frequencies
of NSSI behaviors.
Measures
Depression and anxiety.
The short version of the
Depression
Anxiety Stress Scales
(DASS-21; Henry & Crawford, 2005) is a
self-report instrument including two 7-item scales that measure
depression and anxiety. Each item is rated on a 4-point severity
scale. The DASS-21 has excellent psychometric properties (Henry
& Crawford, 2005).
BPD.
The
McLean Screening Instrument for Borderline Per-
sonality Disorder
(MSI-BPD; Zanarini et al., 2003) is a 10-item
self-report measure of the
DSM–IV
BPD criteria. When compared
with a validated structured interview, sensitivity and specificity
were both above .90 in a sample of young adults (Zanarini et al.,
2003).
Suicidality.
The
Youth Risk Behaviors Survey
(YRBS; Kann,
2001) is administered by the U.S. Center for Disease Control to
assess health-risk behaviors, including suicidal behaviors. The
YRBS items assessing suicidal thoughts and behavior were uti-
lized in the present study. A history of suicidal ideation was
measured by the following item: “Have you ever seriously thought
about killing yourself?” A history of attempted suicide was mea-
sured by the following item: “Have you ever tried to kill yourself?”
Medical severity of past attempts was measured by the following
item: “If you have tried to kill yourself, did any attempt result in
an injury, poisoning, or overdose that had to be treated by a doctor
or nurse?” Participants could answer “yes” or “no” to each ques-
tion. YRBS suicide questions have been found to have good
reliability (Brenner et al., 2002).
History of NSSI.
A questionnaire assessed lifetime frequency
of 12 different NSSI behaviors performed “intentionally (i.e., on
purpose) and without suicidal intent” (i.e., banging/hitting self,
biting, burning, carving, cutting, wound picking, needle sticking,
pinching, hair pulling, rubbing skin against rough surfaces, severe
scratching, and swallowing chemicals). In addition, the question-
naire assessed descriptive features, including age of onset, expe-
rience of physical pain, whether self-injury takes place alone or in
the presence of others, and time from the urge to self-injure until
the NSSI act.
We summarize here this questionnaire’s psychometric proper-
ties. Reliability and validity were examined in a sample of 761
Data Analysis
We performed the LCA using Mplus, Version 4.1 (L. K. Muth´n
& Muth´n, 1998–2006). Model solutions were evaluated on the
24
KLONSKY AND OLINO
Table 1
Lifetime Frequency of 12 NSSI Behaviors in the Full Sample of Self-Injurers (n
205)
0 times
(%)
1or2
times (%)
3–10
times (%)
More than 10
times (%)
Type of behavior
Banging or hitting self
39
11
20
30
Hair pulling
53
6
19
23
Pinching
58
7
17
18
Cutting
60
12
17
11
Biting
61
11
14
13
Wound picking
65
1
15
20
Severe scratching
68
5
16
11
Rubbing skin against rough surfaces
83
3
8
6
Burning
84
7
5
4
Needle sticking
87
4
7
2
Carving
88
5
5
2
Swallowing chemicals
92
3
4
2
Note.
NSSI
nonsuicidal self-injury.
basis of the Bayesian information criterion (BIC) and entropy (B.
Muth´n & Muth´n, 2000). On the basis of a recent simulation
study, the BIC performed better than other information criteria and
likelihood ratio tests in identifying the appropriate number of
latent classes (Nylund, Asparouhov, & Muth´n, 2007). Better
fitting models have lower BIC values. Entropy is an index for
assessing the precision of assigning latent class membership.
Higher probability values indicate greater precision of classifica-
tion.
socially reinforcing and automatically reinforcing functions; (b) a
class of individuals with high probabilities of lifetime biting,
pinching, hair pulling, and banging or hitting oneself; a moderate-
high probability of lifetime of scratching, wound picking, and
rubbing skin; and relatively low levels of automatically and so-
cially reinforcing functions; (c) a class of individuals with
moderate-high probabilities of numerous NSSI behaviors—
including banging or hitting oneself, biting, cutting, hair pulling,
pinching, and scratching—and high levels of both socially rein-
forcing and automatically reinforcing functions; and (d) a class of
individuals with a high probability of cutting, with a moderate-
high probability of wound picking and needle sticking, with high
levels of automatic but not socially reinforcing functions, and who
almost exclusively self-injure when alone. Without exception, as
determined by a series of analyses of variance (ANOVAs),
2
latent
classes that had the highest probability of engaging in a particular
NSSI behavior also engaged in that behavior the most frequently.
Results
Sample Characteristics
Mean age of the sample was 18.5 years (
SD
1.2). Of the
participants, 57% were female. Racial composition of the sample
was as follows: 42% Caucasian, 39% Asian, 6% African Ameri-
can, 5% Hispanic, 1% Native American, and the remaining par-
ticipants indicated their race as “other.” Frequencies for the dif-
ferent NSSI behaviors are presented in Table 1. Banging or hitting
oneself was the most common form of NSSI followed by hair
pulling, pinching, cutting, and biting. Of the sample, 63% had
self-injured within the past year.
Comparison of Classes
After extracting the four latent classes, individuals were as-
signed to their most likely class and were compared on a number
of clinical measures. We conducted group comparisons using
one-way ANOVAs and post hoc least significant difference tests,
Extraction of Latent Classes
Indicators of the LCA were lifetime presence of 12 NSSI
behaviors (cutting, biting, burning, carving, pinching, hair pulling,
scratching, banging/hitting, wound picking, rubbing skin, needle
sticking, and swallowing), descriptive features (absence of pain,
whether NSSI occurs exclusively while alone, time from the urge
to self-injure until the NSSI act), and two superordinate functions
of NSSI (social and automatic reinforcement).
LCAs were conducted that specified 2–10 classes. The best
fitting model, as indicated by the BIC, was the four-class model.
1
The entropy value for the four-class model was high (.912), which
suggests that there was great precision in assigning individual
cases into their appropriate class. As shown in Table 2, this model
included the following: (a) a class of individuals with low proba-
bilities of NSSI behaviors, except a moderate-high probability of
lifetime banging or hitting oneself, and relatively low levels of
1
The four-class solution was selected on the basis of the BIC; however,
the bootstrap likelihood ratio test, Lo–Mendell–Rubin likelihood ratio test,
and entropy provided conflicting results. The four-class solution was
compared on theoretical and empirical grounds to alternative solutions and
appeared more parsimonious and defensible. Additionally, in analyses that
included large numbers of starting values (
100), we found that the data
achieved a global, rather than local, solution. Finally, we note that the
model examined posits that all associations between observed variables
within the latent classes are due to latent class membership. However, this
is a rather rigorous assumption, which is often unrealistic. A more detailed
technical account of the model-fitting process is available to readers upon
request from E. David Klonsky.
2
Detailed results of ANOVAs comparing frequencies of each of the 12
NSSI behaviors across the four latent classes are available upon request
from E. David Klonsky.
 SPECIAL SECTION: SELF-INJURY LCA
25
Table 2
Characteristics of NSSI in the Four Latent Classes of Self-Injurers
Class 1
(
n
125)
Class 2
(
n
35)
Class 3
(
n
23)
Class 4
(
n
22)
Characteristic
Method,
a
n
(%)
Banging/hitting
70 (56.0)
33 (94.3)
14 (60.9)
8 (38.1)
Hair pulling
48 (38.7)
30 (85.7)
12 (52.2)
6 (28.6)
Pinching
41 (32.8)
33 (94.3)
12 (52.2)
0 (0.0)
Cutting
34 (27.2)
16 (45.7)
12 (52.2)
20 (90.9)
Biting
34 (27.2)
33 (94.3)
12 (52.2)
0 (0.0)
Wound picking
31 (24.8)
21 (60.0)
8 (34.8)
12 (57.1)
Scratching
b
22 (17.6)
23 (65.7)
12 (52.2)
9 (42.9)
Rubbing skin
c
7 (5.6)
18 (51.4)
7 (30.4)
3 (14.3)
Burning
8 (6.4)
14 (40.0)
4 (17.4)
7 (33.3)
Needle sticking
0 (0.0)
9 (25.7)
6 (26.1)
11 (52.4)
Carving
4 (3.2)
8 (22.9)
3 (13.0)
10 (47.6)
Swallowing
d
3 (2.4)
0 (0.0)
6 (26.1)
8 (38.1)
Descriptive features,
n
(%)
Pain
e
32 (26.7)
6 (17.1)
5 (21.7)
1 (4.5)
Alone
f
56 (47.5)
20 (57.1)
11 (47.8)
21 (95.5)
Time to act
g
38 (33.9)
10 (29.4)
6 (27.3)
13 (61.9)
Functions,
M
(
SD
)
Social
h
0.30 (.40)
0.39 (.41)
3.25 (.79)
0.72 (.55)
Automatic
h
1.39 (1.05)
1.89 (1.29)
3.39 (1.06)
3.06 (1.39)
a
Indicates the percentage of participants within each class who performed each method of nonsuicidal self-injury
(NSSI).
b
Indicates severe skin scratching.
c
Indicates rubbing skin against rough surfaces.
d
Indicates
swallowing dangerous chemicals.
e
Indicates the percentage of participants who did not experience physical
pain during NSSI.
f
Indicates the percentage of participants who self-injured only when alone.
g
Indicates the
percentage of participants who typically waited more than an hour from the urge to self-injure until the act.
h
A
score of “0” indicates that no items on the scale were endorsed, and a score of “8” indicates maximum
endorsement of items on a scale.
as well as chi-square tests. Results of these analyses are presented
in Table 3.
Significant differences among the classes were observed for the
age of onset of NSSI,
F
(3, 172)
.05. Post hoc comparisons demonstrated that Class 2 had onset of
NSSI significantly earlier than Class 1 and Class 4. The onset of
NSSI for Class 3 was also earlier than Class 4. Class 1 had the
lowest levels of depressive symptoms, which did not differ from
those of Class 2. Levels of depressive symptoms in Class 3 and
Class 4 were significantly higher than in Class 1. Class 3 had
3.77,
p
.05; depressive
symptoms,
F
(3, 204)
5.20,
p
.001; anxiety symptoms,
F
(3,
204)
9.73,
p
.001; and BPD symptoms,
F
(3, 204)
4.73,
p
Table 3
Clinical Differences Among the Four Latent Classes of Self-Injurers
Class 1
(
n
Class 2
(
n
Class 3
(
n
Class 4
(
n
Variable
125)
35)
23)
22)
F
df
s
2
(3)
Age of onset
a
3.77
*
3, 172
M
(
SD
)
13.13 (3.34)
a,b
11.52 (3.14)
c
11.65 (3.22)
a,c
13.81 (1.25)
b
Depression
b
5.20
**
3, 204
M
(
SD
)
4.42 (4.84)
a
5.77 (4.93)
a,b
8.43 (5.87)
b
7.27 (6.26)
b
Anxiety
b
9.73
***
3, 204
M
(
SD
)
4.23 (4.18)
a
4.74 (3.16)
a,b
9.17 (5.29)
c
6.50 (4.78)
b
BPD
c
4.73
**
3, 204
M
(
SD
)
4.33 (2.46)
a
5.43 (2.82)
b
.26 (2.86)
a,b
6.27 (2.47)
b
Suicide,
n
(%)
Ideation
d
11.47
**
50 (40.0)
a
19 (54.3)
a,b
12 (52.2)
a,b
17 (77.3)
b
Attempt
e
14.19
**
16 (12.8)
a
6 (17.1)
a
6 (26.1)
a,b
10 (45.5)
b
Medical
f
17.94
***
7 (5.7)
a
1 (2.9)
a
3 (13.0)
a,b
7 (31.8)
b
Note.
For each row, cell values that do not share subscripts are significantly different according to post hoc tests. BPD
borderline personality disorder.
a
Indicates the age at which nonsuicidal self-injury was first performed.
b
As measured by the Depression Anxiety Stress Scales.
c
As measured by the
McLean Screening Instrument for Borderline Personality Disorder.
d
Indicates lifetime suicidal ideation as measured by the following Youth Risk
Behaviors Survey (YRBS) item: “Have you ever seriously thought about killing yourself?”
e
Indicates lifetime attempt status as measured by the following
YRBS item: “Have you ever tried to kill yourself?”
f
Indicates whether medical treatment was required as measured by the following YRBS item: “If
you have tried to kill yourself, did any attempt result in an injury, poisoning, or overdose that had to be treated by a doctor or nurse?”
*
p
.05.
**
p
.01.
***
p
.001.
 26
KLONSKY AND OLINO
significantly higher levels of anxiety symptoms than the other
classes. Class 4 had significantly higher levels of anxiety than
Class 1. Lastly, Class 4 and Class 2 had significantly higher levels
of BPD symptoms compared with Class 1. A chi-square test found
gender differences among the classes at a trend level,
The third group (11% of the sample) utilized a variety of NSSI
methods, such as banging/hitting, biting, cutting, hair pulling,
pinching, and scratching. This group also heavily endorsed both
social and automatic functions, suggesting that these behaviors
were multiply reinforced. Clinically, members of this group had an
early onset of NSSI and displayed more symptoms of anxiety than
any other group. Thus, this class may be regarded as a “multiple
functions/anxious” group. From a treatment perspective, the early
age of onset and overdetermined nature of the NSSI suggest that
treatment of NSSI could be particularly difficult. To the extent that
NSSI serves to alleviate the elevated anxiety observed in this class,
helping clients reduce and better cope with anxiety would decrease
the need for and occurrence of NSSI.
The fourth group (10% of the sample) almost exclusively com-
prised those who cut themselves in private in the service of
automatic functions. NSSI also appeared to be less impulsive in
this group, as 60% reported that a typical instance of NSSI would
occur more than 1 hr after the urge to self-injure. The typical
latency in the first three groups was less than 1 hr. In light of the
increased latency from urge to act and the heavy endorsement of
automatic functions (which largely reflect emotion regulation;
Klonsky, 2007; Nock & Prinstein, 2004), we suggest that members
of this group often utilize NSSI as a deliberate, premeditated
strategy to regulate negative emotions. As might be expected,
individuals in this group exhibited many symptoms of depression,
anxiety, and BPD. These individuals were also particularly likely
to have attempted suicide and to have required medical treatment
for a suicide attempt. Of the individuals in this group, 46%
reported having attempted suicide, and 32% reported having been
treated by a doctor or nurse as a result of injury, poisoning, or
overdose associated with a suicide attempt. This class may repre-
sent an “automatic functions/suicidal” group. In light of the func-
tions endorsed, treatment for members of this class could include
teaching emotion regulation strategies other than NSSI. That these
individuals tend to let time elapse between NSSI urges and acts
will afford opportunities to implement these strategies. Treatment
should also involve close monitoring of suicidal thoughts and the
relationship of NSSI to suicidal thoughts and behaviors.
Findings from the present study have important clinical impli-
cations. On the one hand, results suggest that NSSI in young adults
is not always accompanied by severe psychiatric symptoms. On
the other hand, many who have self-injured are in considerable
psychiatric distress. Therefore, thorough clinical assessments are
necessary for adolescents and young adults who have self-injured,
especially if NSSI was the sole reason for treatment. For example,
a teacher or counselor who discovers that a student has self-injured
might feel compelled to recommend intensive mental health treat-
ment regardless of the NSSI’s nature or associated clinical fea-
tures. The clinician must carefully determine which and whether
treatment is the optimal course of action.
In addition, some researchers suggest that NSSI belongs on the
same spectrum as attempted suicide (Stanley, Winchel, Molcho,
Simeon, & Stanley, 1992) and that individuals who present to
treatment with a history of NSSI should be regarded as carrying
significant risk of fatality (Fortune, 2006). Clinicians adhering to
these notions may be inclined to hospitalize individuals presenting
with NSSI. Results from the present study suggest that great care
should be taken to select a treatment matching the clinical profile
(e.g.,
2
(3,
N
204)
7.36,
p
.06. There was a higher proportion of women in
Class 4 (82%) compared with Class 1 (53%) and Class 3 (50%).
Class 2 was composed of 63% women. Ethnic composition (i.e.,
proportion of Caucasians) did not differ among the classes,
2
(3,
N
204)
3.73,
p
.29.
In addition, significant differences were found for aspects of
lifetime suicidality, including ideation,
2
(3,
N
205)
11.47,
2
p
.01; attempt,
(3,
N
205)
14.19,
p
.01; and requiring
2
medical attention,
(3,
N
203)
17.94,
p
.001. Class 4 had
a significantly greater proportion of individuals with lifetime sui-
cidal ideation compared with Class 1. Class 4 had a significantly
greater proportion of individuals who had attempted suicide com-
pared with Class 1 and Class 2. Class 4 also had a higher propor-
tion of individuals who had required medical attention for a suicide
attempt than Class 1 or Class 2. The proportion of individuals who
had self-injured in the last 12 months is comparable across latent
classes,
F
(3, 151)
1.87,
p
.14, and thus not driving the pattern
of results regarding the clinical variables.
Discussion
In the present, exploratory study, we sought to identify distinct
subgroups of self-injurers on the basis of the method, descriptive
features, and function of NSSI in young adults. An LCA identified
four subgroups, which differed on key clinical variables. The first
two classes, which comprised almost 80% of self-injurers, exhib-
ited fewer clinical symptoms. This result is consistent with our
earlier speculation that some self-injurers have fewer psychiatric
symptoms than others. Notably, these two classes contained some
individuals who had performed more severe forms of NSSI (e.g.,
cutting, carving).
The first group, comprising 61% of participants, performed
relatively few NSSI behaviors and displayed the fewest clinical
symptoms. Members of this group may be those who experimented
with NSSI on a few occasions, as opposed to those who self-injure
more chronically in response to psychiatric distress. This class may
be regarded an “experimental NSSI” group.
In comparison with the first group, the second group (17% of the
sample) had an earlier onset of NSSI and performed more NSSI
behaviors, particularly biting, pinching, and banging/hitting.
Therefore, the NSSI in this group appears to represent more than
just occasional experimentation. This group also endorsed slightly
more BPD symptoms than the first group, although the overall
level of clinical symptomatology was relatively low. That the
NSSI behaviors most characteristic of this group could be consid-
ered less severe as compared with cutting or swallowing chemicals
may account for the absence of severe psychopathology. This class
may be regarded as a “mild NSSI” group.
The third and fourth groups identified by the LCA comprised
22% of the sample. Both exhibited increased clinical symptom-
atology. To the extent that the results generalize, we could extrap-
olate that approximately one in five young adults who have en-
gaged in NSSI have heightened psychiatric problems requiring
more aggressive treatment.
inpatient
treatment for severe self-injury with comorbid
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