Byun, Ruffini Internet Addiction Metasynthesis of 1996–2006 Quantitative Research

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C

YBER

P

SYCHOLOGY

& B

EHAVIOR

Volume 12, Number 2, 2009
© Mary Ann Liebert, Inc.
DOI: 10.1089/cpb.2008.0102

Rapid Communication

Internet Addiction: Metasynthesis of 1996–2006

Quantitative Research

Sookeun Byun, Ph.D.,

1

Celestino Ruffini, B.Sc.,

2

Juline E. Mills, Ph.D.,

3

Alecia C. Douglas, Ph.D.,

4

Mamadou Niang, M.Sc.,

5

Svetlana Stepchenkova, M.Sc.,

2

Seul Ki Lee, B.Sc.,

2

Jihad Loutfi, B.Sc.,

2

Jung-Kook Lee, Ph.D.,

6

Mikhail Atallah, Ph.D.,

7

and Marina Blanton, Ph.D.

8

Abstract

This study reports the results of a meta-analysis of empirical studies on Internet addiction published in acad-
emic journals for the period 1996–2006. The analysis showed that previous studies have utilized inconsistent
criteria to define Internet addicts, applied recruiting methods that may cause serious sampling bias, and ex-
amined data using primarily exploratory rather than confirmatory data analysis techniques to investigate the
degree of association rather than causal relationships among variables. Recommendations are provided on how
researchers can strengthen this growing field of research.

203

Introduction

T

HE

I

NTERNET HAS EMERGED

as an essential media channel

for personal communications, academic research, infor-

mation exchange, and entertainment.

1

While the positive as-

pects are renowned, concerns continue to mount regarding
problematic Internet usage behaviors.

2

It is currently esti-

mated that approximately 9 million Americans could be la-
beled as pathological computer users addicted to the Inter-
net to the detriment of work, study, and social life.

3,4

Among

all behavioral addictive traits, the Internet stands out for its
relevance to the future and its promise of potentially deliv-
ering harmful results to millions as access to the Internet rises
globally.

To better understand Internet addicted behaviors, re-

searchers have explored its symptoms, attempted to con-
cretize the characteristics of addicts, conceptualized its an-
tecedents and consequences, and developed corresponding
measurement items. This study provides directions for fu-
ture research through reflections on empirical research on
Internet addiction over the 10-year period 1996–2006. Specif-
ically, this study addresses the following questions: How has
Internet addiction been measured? What aspects of the In-

ternet addiction phenomenon have been investigated by aca-
demic researchers? Given the sensitive nature of the topic,
how have survey respondents been selected? and What are
the predominant methods of data analysis in Internet ad-
diction studies? In exploring these questions, various chal-
lenges to academic researchers are also presented.

Defining Internet Addiction

The capacity of the Internet for socialization is a primary

reason for the excessive amount of time people spend hav-
ing real-time interactions using e-mail, discussion forums,
chat rooms, and online games.

5

User participation at sites

such as Blogger.com, MySpace.com, and Wikipedia.org in-
creased by 525%, 318%, and 275% respectively.

6

However,

the networking capabilities of the Internet can cause social
isolation and functional impairment of daily activities.

7

In

the workplace, Internet addictive behavior symptoms in-
clude a decline in work performance and a withdrawal from
coworkers, leading to reduced job satisfaction and decreased
efficiency.

8

Broadly speaking, addiction is defined as a “compulsive,

uncontrollable dependence on a substance, habit, or practice

1

College of Business Administration, Kwangwoon University, Seoul, South Korea.

2

Department of Hospitality and Tourism Management, Purdue University, West Lafayette, Indiana.

3

College of Business, University of New Haven, Connecticut.

4

Hotel and Restaurant Management, Auburn University, Auburn, Alabama.

5

Department of Industrial Technology, Purdue University, West Lafayette, Indiana.

6

Division of Business, Indiana University–Purdue University at Columbus, Indiana.

7

College of Computer Sciences, Purdue University, West Lafayette, Indiana.

8

College of Computer Science, University of Notre Dame, Indiana.

background image

to such a degree that cessation causes severe emotional, men-
tal, or physiological reactions.”

9

A perusal of the literature

revealed various names for Internet addiction, including cy-
berspace addiction, Internet addiction disorder, online ad-
diction, Net addiction, Internet addicted disorder, patholog-
ical Internet use, high Internet dependency, and others.

1,10

Among these terms, Internet addiction is most popular.

4,11

However, while Internet addiction has received attention
from studies in various fields,

12

no clear definition currently

exists. Some researchers have adapted substance use disorder,
while others reference pathological gambling,

13

resulting in an

inconsistent definition of Internet addiction.

7,14,15

Many re-

searchers, due to the complex nature of the topic, do not pro-
vide a clear definition of Internet addiction.

2,16,17

For the purposes of this study, we define Internet addic-

tion following Beard’s holistic approach wherein “an indi-
vidual is addicted when an individual’s psychological state,
which includes both mental and emotional states, as well as
their scholastic, occupational and social interactions, is im-
paired by the overuse of the medium.”

18

While this defini-

tion is used as a guide, it must be noted that it does not to-
tally encompass the underlying structure of the term. A
standardized definition will become increasingly important
as fascination with the topic grows. As such, we propose
Challenge 1 to researchers: Develop a complete definition of
Internet addiction that is not only conclusive but decisive,
covering all ages, gender, and educational levels.

Methodology

We employed a meta-analysis approach

19

to appraise the

cumulative outcome of empirical research on Internet ad-
diction. A study was considered empirical if it used human
participants and a quantitative instrument to measure Inter-
net addiction. To ensure quality and completeness, only full-
length articles in peer-reviewed journals or conference pro-
ceedings were considered. Searches of academic databases
and of Google and Yahoo! using keywords Internet addiction,
Internet addicted, problematic Internet usage, and computer ad-
diction
resulted in 120 articles spanning the period 1996–2006
(see www.netaddict.org/IA120.xls). A total of 61 articles
were found to have implemented quantitative analysis ap-
proaches using empirically based surveys and human par-
ticipants. Further, 22 articles were excluded because they fo-
cused more on the social and economic costs of Internet
addiction, treatment problems, or employee termination due
to excessive Internet use. A list of the final 39 articles is avail-
able at www.netaddict.org/IA39.xls.

Results

Reflection 1: How has Internet addiction been measured
over the period 1996–2006?

Most of the studies on Internet addiction adapted their cri-

teria for analysis from the Diagnostic and Statistical Manual of
Mental Disorders
(DSM) handbook,

20

the most frequently

used manual for the diagnosis of mental disorders. While In-
ternet addiction is not currently recognized in the DSM, it
does describe the criteria for diagnosing pathological gam-
bling (DSM-IV 312.31), a type of behavioral impulse-control
disorder.

16

Goldberg,

21

a pioneer in the field, developed the

Internet Addictive Disorder (IAD) scale by adapting the

DSM-IV and providing several diagnostic criteria, including
two commonly used statements often seen in Internet ad-
diction research: “hoping to increase time on the network”
and “dreaming about the network.” Brenner

22

developed the

Internet-Related Addictive Behavior Inventory (IRABI) with
32 true-or-false questions, and Morahan-Martin and Schu-
macher

23

constructed the Pathological Internet Use (PIU)

scale with 13 yes/no questions by adapting the DSM-IV. In
a bid to simplify the measurement process, Young

24

devel-

oped the 8-question Internet addiction Diagnostic Question-
naire (DQ) based on the DSM-IV. Young claimed that ex-
cessive use of the Internet is another type of behavioral
impulse-control disorder, and as such, if a respondent an-
swered yes to more than 5 of the 8 questions, the respondent
could be defined as an Internet dependent user.

24

The cut-

off score of 5 was consistent with that of the criteria for patho-
logical gambling. While Young’s instrument has the advan-
tage of simplicity and ease of use,

12

it in no way covers all

the antecedents of Internet addictive behavior, nor does it
provide a clearer understanding of the topic.

Realizing the need for a stricter and more conservative

judgment, Chou and Hsiao

12

utilized both the IRABI and the

DQ and defined Internet addicts only when respondents
meet both criteria simultaneously. They found 50% fewer In-
ternet addicts than when the other methods alone were used.
This lack of consensus has motivated other researchers to de-
velop new measures of Internet addiction rather than rely
heavily on the DSM-IV criteria (e.g., Widyanto and McMur-
ran

2

Internet Addicted test [IAT] and Shapira et al.

26

Struc-

tured Clinical Interview for Diagnostic and Statistical Man-
ual of Mental Disorders-IV [SCID-IV]). Attempts have also
been made to define Internet addicts by a single
question,

e.g.,11,27

primarily the amount of time spent online.

While the length of time is the most frequently reported pre-
dictor,

4

it has severe limitations in that it is only one symp-

tom of Internet addicted behavior rather than a parsimo-
nious item of diagnosis.

The challenge of measurement is also compounded by re-

searchers’ reworking scales to suit their specific circum-
stances. For example, Chou and Hsiao

12

categorized 5.9% of

their college student sample in Taiwan as Internet addicts
by utilizing the Chinese Internet-Related Addictive Behav-
ior Inventory version II (C-IRABI-II)

22,28

and Young’s

24

cri-

teria. While such changes are important from a cultural per-
spective, these scales have not been standardized for efficient
cross-study comparisons. Thus we propose Challenge 2 to re-
searchers:
Previous studies on Internet addiction have used
inconsistent criteria, making any comparison across study
findings meaningless.

13,16

Future researchers should con-

sider using prior works to develop a major study leading to
a standardized instrument for measuring Internet addiction
across cultural perspectives.

Reflection 2: What aspects of Internet addiction
phenomenon have been investigated?

Primary antecedents of Internet addiction explored by re-

searchers were based on participants’ personality, low in-
terpersonal skills, and high levels of intelligence. Ko et al.

29

assess Internet addiction through five dimensions: compul-
sive use, withdrawal, tolerance, interpersonal and health
problems, and time management problems. Hur

10

measured

BYUN ET AL.

204

background image

the degree of self-control, Internet dependency, psychologi-
cal distress, and abnormal behavior in which the four con-
structs are viewed as the actual causes of Internet addiction
disorder rather than its underlying dimensions. In addition,
Caplan

30–32

developed a theory-based measure of problem-

atic Internet use and assessed its association with such psy-
chological variables as depression, self-esteem, loneliness,
and shyness. Research focused on predicting Internet ad-
diction also included sensation seeking and poor self-esteem
as predictors of excessive Internet use;

33

shyness, locus of

control, and online experience as predictors of Internet ad-
diction;

34

and attitudes toward computer networks and In-

ternet addiction.

35

Most researchers focused on the associa-

tions among constructs, such as the relationship between
Internet usage and interpersonal skills, personality, and in-
telligence;

36

between attention-deficit/hyperactivity/impul-

sivity symptoms and Internet addiction;

37

and between In-

ternet addiction and depression and suicidal ideation.

38

Few

studies questioned the existence of Internet addiction as a
separate form of addiction and investigated whether or not
the condition should be placed under other, previously iden-
tified disorders.

39–44

These studies did not find significantly

different overarching theories concluding that in general, In-
ternet addicts tend to be lonely, have deviant values, and to
some extent lack emotional and social skills.

36

A number of

studies

10,11,23,34,45–49

profiled Internet addicts using demo-

graphic characteristics and examined features common to
participants that made them more vulnerable to developing
an addiction, including psychiatric symptomatology and
personality characteristics among excessive Internet users.

45

While the number of studies are increasing, work is

needed to provide more stable evidence to support the find-
ings of prior research. In sum, these authors found that while
use of the Internet was associated with loneliness, no link-
age was found between personality and Internet use. Most
concluded that more work is needed to distinguish between
predisposition to excessive Internet usage and its actual con-
sequences. Challenge 3 to researchers: Develop a seminal text
in the field that encompasses the cyberpsychological aspects,
provide concrete signs of identification, and identify proven
short- and long-term treatment strategies for Internet ad-
dicts.

Reflection 3: Given the sensitive nature of the topic, how
have survey respondents been selected?

Studies on Internet addiction most often appropriately em-

ploy Internet survey methods. In an analysis of the challenges
associated with Internet surveying, Couper

50

concludes that

if a survey targets Internet users only, it is a good decision
to employ the Internet survey mode. With a few excep-
tions,

e.g.,13,29

most of the studies used Internet-based survey

formats as well as used high school and university student
samples.

10,17,25,51

Our meta-analysis revealed that the differ-

ent sample selection criteria across the studies have brought
varying conclusions on the prevalence of Internet addiction.
When more representative samples were selected, the per-
centage of Internet addicts tend to be lower than in studies
with on-campus college student samples

e.g.,10,13,16,34,39

It is

understood that adolescents are at a point in their life cycle
where they are very vulnerable to harmful addictive agents

13

and can be easily persuaded to change their behaviors as they

are more accepting of technology tools. While this might be
one explanation of why previous studies mainly examined
Internet addiction focusing on the younger generation, it is
important to note that very rarely do these studies raise red
flags on Internet addiction levels among teenage and college
populations that are purportedly prone to Internet addictive
behavior. We are left to ponder: Have we targeted the wrong
population for analysis? Have mainstream stereotypes af-
fected research in the area where we have become short-
sighted to the perils of the real populations that suffer from
Internet addiction, such as online gamblers?

Recognizing this deficiency, several researchers have at-

tempted to recruit samples outside of schools; however, most
of these sample recruitment methods suffer from sampling
bias.

2,33

For example, participants in Armstrong et al.’s

33

study were recruited by using a convenience sampling
method: (a) survey invitation message posted on an Internet
addiction forum Web site and (b) survey e-mails sent to ac-
quaintances asking them to forward the e-mail to others.
These recruiting methods seem to bring significantly biased
respondents because the surveys were completed by self-se-
lected Internet users. Such errors are also noted when re-
searchers utilized additional media to recruit samples, such
as through nationally and internationally dispersed news-
paper advertisements.

11,24

While this extends the diversity

of media in recruiting, the sample selection criteria are still
far from the randomization principle and raise questions re-
garding sample coverage errors. For example, the character-
istics of people who are aware of and visit a related forum
Web site may differ from those who are Internet addicts but
do not visit any of these sites. Thus, Challenge 4 to researchers:
Begin to examine sample selection and its effect on study
outcomes. Use sound sampling techniques that result in
fewer problems in generalizing the findings of the study to
its population. Use samples that are not convenient or “safe-
haven” student samples and that are more reflective of the
entire population of Internet users. Current statistics reveal
that the over-50 age group is a growing population of Inter-
net users; researchers should begin to examine these popu-
lations and their development of Internet addictive behav-
iors.

Reflection 4: What are the predominant methods of data
analyses in Internet addiction studies?

Our meta-analysis found that prior studies on Internet ad-

diction have focused on “proving” the existence of Internet
addiction or identify the characteristics of Internet addicts.
The analysis methods employed were thus exploratory
rather than confirmatory. Ko et al.

29

and Soule et al.

11

tested

the personal characteristics of Internet addicts using
ANOVA. Through t tests between Internet addicts and non-
addicts, Chou and Hsiao

12

found that addicts spent signifi-

cantly more hours online and perceive the Internet as more
entertaining, interactive, and satisfactory than do nonad-
dicts. Regression is the most common form of inferential sta-
tistics used in Internet addiction studies.

12,33

Using stepwise

regression analysis, Chou and Hsiao

12

found that self-re-

ported communication pleasure experience, hours spent on
bulletin board services (BBS), gender, satisfaction score, and
hourly e-mail usage are the best predictors of Internet ad-
diction.

INTERNET ADDICTION

205

background image

Few studies have applied cause-and-effect techniques,

such as structural equation modeling, to test Internet addic-
tion models. However, several limitations have emerged in
the data analyses and interpretation stages of these projects.
For example, Davis et al.

1

developed the Online Cognition

Scale (OCS) from the literature on problematic Internet use
and tested its dimensionality using AMOS, a tool for struc-
tural equation modeling (SEM). While their approach was
confirmatory, more respondents were needed when the
number of items in the model was considered;

4

as such, the

study did not conform to the standard sampling guidelines
of SEM. Similarly, Widyanto and McMurran

2

and Davis et

al.

1

also suffered from too-small sample sizes.

52

In addition,

Pratarelli and Browne,

17

acknowledging the lack of robust-

ness, still interpreted their research models in spite of the
bad model fit indices (chi-square value over 2,880 with 524
degrees of freedom and RMSEA over 0.9). In addition, some
factor loading values were over 1.0, showing problems with
the measurement items within the model. Thus, we propose
Challenge 5 to researchers: While the findings of studies that
utilized first-generation analysis are still valuable and have
advanced our knowledge on Internet addiction so far, re-
searchers are encouraged to develop confirmatory research
models by utilizing the findings of preceding exploratory
studies and theories in the psychology discipline.

Conclusion

In general, Internet addiction has commonly been viewed

as an extremely broad topic with few common definitions
and little guidance. Researchers should work to develop a
standardized definition of Internet addiction with support-
ing justification. We found that previous studies on Internet
addiction were primarily concerned with the antecedents of
Internet addiction and with identifying features in partici-
pants that made an individual more susceptible to becom-
ing an Internet addict. However, the development of the con-
cept, due to its complex nature, requires more systematic
empirical and theory-based academic research

10

to arrive at

a more standardized approach to measurement. The use of
representative samples and data collection methods that
minimize sampling bias is highly recommended. Further,
implementation of analyses methods that can test causal re-
lationships, rather than merely examining the degree of as-
sociations, are recommended so that antecedents and con-
sequences of Internet addiction can be clearly differentiated.
The outcomes of this quantitative meta-analysis serves as a
basis for those looking forward to expanding this field of
study not simply as an accumulation of relevant knowledge
but more as a basis of formulating a more sustainable foun-
dation for the development of treatment approaches.

Acknowledgment

This study was supported by National Science Founda-

tion Grant No. 0627488 titled: “CT-ISG: Improving the pri-
vacy and security of online survey data collection, storage,
and processing.” The views expressed in this article do not
reflect the opinions of the NSF.

Disclosure Statement

The authors have no conflict of interest.

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Address reprint requests to:

Svetlana Stepchenkova

Department of Hospitality and Tourism Management

Purdue University, 154 Stone Hall

700 W. State Street

West Lafayette, IN 47907-2059

E-mail: svetlana@purdue.edu

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