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The Effects of Group Cognitive Behavioral Therapy on the Improvement of Depression and Anxiety in Adolescents with Problematic Internet Use
J Korean Acad Child Adolesc Psychiatry 2018; 29(2): 73-79
Published online April 1, 2018
© 2018 Korean Academy of Child and Adolescent Psychiatry.

Sang-Hyun Kim1, Hyeon-Woo Yim2, Sun-Jin Jo2, Kyu-In Jung3, Kina Lee4, and Min-Hyeon Park3

1Department of Psychiatry, Uijeongbu St. Mary’s Hospital, The Catholic University of Korea College of Medicine, Uijeongbu, Korea,
2Department of Preventive Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea,
3Department of Psychiatry, St. Paul’s Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea,
4Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea
Correspondence to: Min-Hyeon Park, Department of Psychiatry, The Catholic University of Korea, St. Paul’s Hospital, 180 Wangsan-ro, Dongdae-mun-gu, Seoul 02559, KoreaTel: +82-2-958-2153, Fax: +82-31-847-3630, E-mail:
Received October 16, 2017; Revised December 19, 2017; Accepted January 12, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


The overuse of the Internet among adolescents has increased dramatically in recent years, leading to pathological or problematic Internet use. Cognitive behavioral therapy (CBT) is known to be effective for the treatment of problematic Internet use, particularly for adolescents. The aim of the present study was to evaluate the therapeutic efficacy of group CBT for problematic Internet use in adolescents.


A total of 17 patients aged 12-17 years who met Young’s diagnostic questionnaire criteria of problematic Internet use participated in a school-based eight-session group CBT program. The level of problematic Internet use among participating students was measured using Young’s Internet Addiction Scale (IAS). Depression and anxiety levels were evaluated using the Children’s Depression Inventory (CDI) and the State-Trait Anxiety Inventory (STAI), respectively. Each construct was assessed at baseline, immediately after the intervention, and at a one-month follow-up visit. Statistical significance was based on a p-value of <0.05.


Immediately after the program, the IAS, CDI, and State Anxiety Inventory (SAI) scores were significantly lower than before the program. At the one-month follow-up assessment, the IAS scores remained low, and the CDI and SAI scores were even lower than immediately after the program.


Group CBT was effective for adolescents with problematic Internet use, and was also demonstrated to improve depression and anxiety.

Keywords : Problematic Internet use, Depression, Anxiety, Group cognitive behavioral therapy

As of 2015, 96.6% of Korean teenagers are using the Internet at least once a day, and the average usage time is 14.5 hours a week.1) However, as problems related to the use of the Internet have become increasingly evident, the term ‘Internet addiction’ has received much attention. The term ‘Internet addiction’ was coined by Goldberg2) and was defined as the pathological and compulsive use of the Internet. Young proposed diagnostic criteria for problematic Internet use according to the Diagnostic and Statistical Manual of Mental Disorders-fourth edition (DSM-IV)3) pathological gambling diagnostic criteria.4) However, the definition of problematic Internet use remains controversial, and the DSM-5, which is currently being revised, does not have problematic Internet use diagnostic criteria because it is difficult to define as a disease. Only Internet gaming disorder has been categorized as a diagnosis requiring further study.

In a number of studies, problematic Internet use has been associated with depression, anxiety disorders, social phobia, substance-related disorders, obsessive-compulsive disorder, attention deficit hyperactivity disorder, and impulse control disorder.5-7) Problematic Internet use is particularly serious in children and adolescents. According to the Internet addiction survey in 2014, 12.5% of adolescents were found to be at risk of Internet addiction,8) and the problematic Internet use of children and adolescents is known to negatively affect academic achievement and family relationships.9,10)

As demonstrated by definitions of Internet addiction,4) problematic Internet use is also understood to be a behavioral addiction with ‘tolerance’ and ‘withdrawal’ symptoms, and has neuropsychological and pathological mechanisms similar to those of other substance use disorders or gambling disorders.11-13) Alcohol use disorder and gambling disorder treatment programs are primarily based on cognitive behavioral models.14) Through cognitive behavioral therapy (CBT), patients become more aware of addictive behaviors and emotions, and the thoughts that cause them, and realize that they are repeating their addictive behaviors in certain dynamics. Therefore, CBT can be introduced to treat problematic Internet use. In particular, group interventions are advantageous in terms of efficiency, provision of alternative learning opportunities, and peer feedback when there are many subjects with relatively homogeneous characteristics,15,16) and are practiced universally for the treatment of problematic Internet use.17) In addition, the subjects will deal with their emotional state by examining the causes of the Internet use in the treatment process. Therefore, it is thought that emotions will also be affected.

Therefore, this study applied group CBT for treatment of problematic Internet use among Korean adolescents who have easy access to the Internet, and attempted to identify associated depression and anxiety symptoms along with strategies for mitigation and maintenance of effects.



This study was conducted as part of a project for the Promotion of Child and Adolescent Mental Health in the mental health center of Seocho-gu district. The Korean Internet addiction self-report test18) was administered to 389 students (40 female students) in the first and second grade of one industrial high school and 253 students in the first grade of one female middle school, and a high-risk group and a potential risk group were selected. A psychiatrist conducted 1:1 interviews using Young’s Diagnostic Questionnaire to exclude false positives from the 48 selected industrial high school students (12.34%) and 13 female middle school students (5.14%). Exclusion criteria included the following: 1) no problematic Internet use, as determined in an interview with a psychiatrist, 2) treatment for a psychiatric disorder, 3) currently receiving treatment for problematic Internet use, 4) unwillingness to participate or unwillingness of the students’ parents to enroll them in the program, and 5) opposed to participation due to problems such as school classes. A total of 17 students (7 industrial high school students and 10 female middle school students) participated in the program.

Procedures, contents, and operation of group programs

Consent was provided by each student and their parents prior to the program, and the study was approved by the Institutional Review Board of the Catholic University (CUMC09U133). The group CBT program consisted of eight sessions, with two sessions per week, and details of each session are included in Appendix.

Screening scale and effect evaluation scale

Screening scale

Korean Internet addiction self-report test (K-scale)

This is a self-diagnostic scale for measuring tendencies for addiction to Internet use in adolescents, and was developed for Korean adolescents by the National Information Society Agency under the Ministry of Information and Communication.

Young’s Diagnostic Questionnaire (YDQ)

This is a diagnostic questionnaire composed of eight items modified from the DSM-IV’s pathological gambling model. If five or more answers are “yes”, respondents are classified as problematic Internet users, and if fewer than five answers are “yes”, respondents are classified as normal Internet users.4)

Effect evaluation scale

Young’s Internet Addiction Scale (IAS)

The Young’s Internet Addiction Scale (IAS) is a self-report 20-item scale with responses of 1 to 5 points for each item. An IAS score of 40-69 points indicates that problems with Internet use are occasional or frequent. A score of ≥70 points is considered to indicate serious problems with Internet use.19)

Children’s Depression Inventory (CDI)

This is a self-report scale that evaluates the cognitive, emotional, and behavioral symptoms of childhood depression.20) A score of 22-25 points indicates mild depression, 26-28 points indicates moderate depression, and ≥29 points indicates severe depression.

State-Trait Anxiety Inventory (STAI)

This measure is composed of 20 items of the State Anxiety Inventory (SAI), which evaluates current anxiety, and 20 items of Trait Anxiety Inventory (TAI), which evaluates anxiety tendency.21) The SAI indicates that a score of 41-44 points indicates slightly high current anxiety levels, 45-48 points indicates moderately high current anxiety levels, and ≥49 points indicates extremely high current anxiety levels. In the TAI, the anxiety tendency is indicated to be slightly high at a score of 39-42 points, moderately high at 43-46 points, and extremely high at ≥47 points.

Statistical analysis

The differences in the baseline and post-intervention evaluation scores of the intervention program were analyzed by paired t-tests, and the differences in the pre- and post-follow-up evaluation indices were analyzed by repeated measures analysis of variances. The differences in the Internet use of the industrial high school students and the female middle school students were analyzed using Fisher’s exact test. Statistical significance was based on a p-value of <0.05. All statistical analyses were performed using SPSS 20.0 for Windows (IBM Corp., Armonk, NY, USA).


Clinical characteristics and characteristics related to Internet use (Table 1)

Internet use pattern of subjects and initial score of rating scales

 Boys (n=7)  Girls (n=10) 
Time being spent for Internet use (hours/day)
 <21 (14.29)5 (50.00)
 2<−<43 (42.86)2 (20.00)
 4<−<83 (42.86)2 (20.00)
 >8-1 (10.00)
Peak time of Internet usage
 After school-Evening1 (14.29)6 (60.00)
 Evening-Midnight2 (28.57)2 (20.00)
 Midnight-Daybreak1 (14.29)-
 All day long (If have a chance)3 (42.86)2 (20.00)
First time of playing computer game (age)8.5 (2.07)8.3 (2.31)
The date being addicted to Internet
 Immediately after Internet use4 (66.67)2 (22.22)
 6 month after Internet use-1 (14.29)
 2 year after Internet use2 (33.33)6 (66.67)
Main usage
 MMORPG4 (57.14)3 (30.00)
 RTS2 (28.57)
 FPS1 (10.00)
 Other contents besides Internet games (chatting or websurfing) 1 (14.29)6 (60.00)
IAS60.2 (13.4)60.3 (13.2)
CDI25.6 (2.1)25.7 (3.2)
SAI43.4 (6.2)35.2 (7.2)
TAI49.9 (3.0)47.7 (3.5)

Data present number (percent) or mean (standard deviation). CDI: Children’s Depression Inventory, FPS: first person shooting, IAS: Young’s Internet Addiction Scale, MMORPG: massive multiplayer online role playing game, RTS: real-time strategy, SAI: State Anxiety Inventory, TAI: Trait Anxiety Inventory

There was no difference in time between the first use of the Internet and the start of problematic Internet use (p=0.287). The mean Children’s Depression Inventory (CDI) total scores for the two schools were indicative of mild depression. The SAI total scores were higher among industrial high school students, while the scores of female middle school students were within the normal range. The mean TAI total scores of the subjects in the two schools indicated that the level of anxiety tendency was very high.

The effect of program intervention (Table 2)

Comparision of pre-and post intervention effect

VariablesPrePost p-value 

IAS 59.88±12.48  50.71±10.75 <0.0001

CDI: Children’s Depression Inventory, IAS: Young’s Internet Ad- diction Scale, SAI: State Anxiety Inventory, TAI: Trait Anxiety In- ventory

A total of 17 students participated until the end of the session, without any dropouts during the 8th session.

The IAS total score decreased significantly in the post-intervention evaluation compared to the baseline evaluation total score (p<0.001). CDI and SAI total scores also significantly decreased in the post-intervention evaluation (p=0.006 and p<0.0001, respectively). There was no significant change in the TAI total score (p=0.122). Thirteen out of 17 students reported a reduction in the amount of time spent using the Internet after the program. Among the students who reported a reduction in Internet usage, the mean Internet usage time before the program was 4.75 hours (±1.94), while the average Internet usage time after the program was 2.77 hours (±1.92) (p<0.0001). After the program, eight students reported an increase in the amount of time spent studying, and nine students reported no change. There were two students who felt that their Internet habits were not harmful after the program, and there were ten students who knew that their Internet usage habits were harmful, but found them hard to correct. A total of five students were advised to correct the harmful Internet habits after the program.

Follow-up evaluation

A total of seven students among the ten female middle school students who participated in the program performed follow-up evaluations 1 month after the end of the program. There were no significant differences in the IAS (pre p=0.814, post p=0.723), CDI (pre p=0.127, post p=0.601), SAI (pre p=0.076, post p=0.482), and TAI scores (pre p=0.422, post p=0.731) before and after the follow-up evaluation. Fig. 1 presents the comparison of the baseline and post-intervention scores.

Compared to the IAS, CDI, and SAI pre-intervention scores, the corresponding follow-up scores were low (p=0.054, 0.015, 0.058, respectively). The IAS and SAI scores did not significantly differ between the post-intervention and the follow-up evaluations (p=0.664, 0.961, respectively). The CDI scores were not significantly different, but the follow-up scores were lower than the post-intervention scores (p=0.093).

Fig. 1.

Score comparison between pre, post intervention and one month later. CDI: Children’s Depression Inventory, IAS: Young’s Internet Addiction Scale, SAI: State Anxiety Inventory.

The CDI and SAI scores decreased overall in the follow-up evaluation. The changes in the number of students assigned to each severity category over the three evaluations are presented in Figs. 2 and 3.

Fig. 2.

Number of students according to Children’s Depression Inventory score.

Fig. 3.

Number of students according to State Anxiety Inventory score.


In the present study, the IAS scores after the program were significantly lower than the scores before the program, and this effect was maintained in the follow-up evaluation 1 month later. The program allowed the participants to think about alternative activities to using the Internet, and to improve their self-regulation abilities. This finding is consistent with previous studies, indicating a significant decrease in the Internet addiction scores via problematic Internet use group therapy.17)

This study also demonstrated that the scores on the CDI, a measure related to depression, were reduced despite the fact that the treatment targeted problematic Internet use. These scores were further reduced in the follow-up evaluation 1 month after the program was completed. In another study, the subscale related to the emotional symptoms of the Strength and Difficulties Questionnaire after group therapy for adolescents with problematic Internet use also reported that the effect size was larger in the 6 month follow-up evaluation than at the end of the program.22) Other problematic Internet use group therapy studies also reported a decrease in depression after treatment.17) Yen et al.23) reported that problematic Internet use and depression increased mutual vulnerability and shared genetic and environmental risk factors. Young suggested that problematic Internet users may forget their stress during Internet access hours, which is similar to drinking alcohol as a form of escape.4) Therefore, depression is the leading cause of problematic Internet use. In addition, the use of the Internet as an compulsive behavior for solving social isolation, loneliness, or negative and nervous emotional states was observed in Internet addiction patients.24) Therefore, CBT is used to restore the emotional state, and the use of the Internet as a compulsive behavior is replaced by a new healthy method to prevent recurrence.

Similar to depression, in relation to anxiety, SAI scores were significantly lower after the program, and the effect was maintained at the 1 month follow-up evaluation. TAI scores did not significantly decrease after the program, which is consistent with the findings of previous studies.14) Previous studies have demonstrated a high level of social anxiety among adolescents with problematic Internet use.25) In addition, loneliness, shyness, and avoidance of social relationships are associated with problematic Internet use.26,27) Finally, to reduce anxiety, socially unstable individuals prefer to communicate via the Internet with a low risk of social communication and therefore exhibit vulnerability to problematic Internet use.28) Thus, it is assumed that these individuals have addressed the mutual improvement result by not only reducing Internet use via group CBT, but also by experiencing positive social communication opportunities.

In this study, participants in the program and their parents were very receptive, as observed by the absence of any dropouts. The reason for the lack of dropouts is that the definition of ‘Internet addiction’ itself is vague, and a definite diagnostic system has not been established,29,30) which makes it less important to stigmatize the psychiatric illness. Therefore, in the case of patients with depressive disorder or anxiety disorder who have problematic Internet use simultaneously, a therapeutic approach based on problematic Internet use treatment, which is relatively less resistant, can be considered.

In this study, the treatment effect was maintained when the IAS, CDI, and State-Trait Anxiety Inventory were evaluated at the 1 month follow-up. It seems that a follow-up evaluation study will be needed at several time points in the future, given the results of a study in China wherein the treatment effect in the Internet addiction group was maintained even after 6 months, based on scores on the scales measuring Internet addiction, depression, and anxiety.22)

The limitations of this study are as follows. First, it is difficult to generalize these conclusions to all students because it is a program implemented in one specific female middle school and one industrial high school. Second, there was no control group; therefore, the possibility of changing the score of the evaluation tool by the group variable was not corrected. Third, we relied on self-report evaluation scales and did not seek evaluations from teachers, parents, or clinicians. Fourth, only voluntary participants with a willingness to decrease problematic Internet use participated in the study. Therefore, it is possible that the Pygmalion effect might have affected the outcome from the expectation that the subjects should improve. However, the prevalence of these prejudices seems to be low, given that the TAI scores were almost unchanged before and after the program.


In this study, students who were assessed as problematic Internet users attended group CBT to improve Internet addiction. As a result, students’ time spent on the Internet decreased and the degree of addiction improved. In addition, group CBT was effective in alleviating concurrent depression and anxiety symptoms, and the treatment efficacy up to 1 month was considered to be maintained. Larger-scale, long-term studies should be conducted in the future.


This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (NRF-2014R1A1A2057866 and 2017R1D1A1B03031680).

Conflicts of Interest

The authors have no financial conflicts of interest.

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