Wölfling, K., Müller, K. W., Dreier, M., Ruckes, C., Deuster, O., Batra, A., Mann, K., Musalek, M., Schuster, A., Lemenager, T., Hanke, S., & Beutel, M. E. (2019). Efficacy of short-term treatment of internet and computer game addiction. JAMA Psychiatry, 76 (10), 1018. https://doi.org/10.1001/jamapsychiatry.2019.1676
Summary by: Vali Ibrahimi
Introduction
The article by Wölfling et al. (2019) starts off by discussing internet and computer game addiction in relation to the diagnostic frameworks of the DSM-5 and ICD-11. While internet gaming disorder was included in the DSM-5 as a condition for further study, gaming disorder was recognized as a disorder in the ICD-11. Wölfling et al. (2019) discuss the broader concept of Internet Addiction (IA), which includes several different subtypes. The authors note a higher prevalence of gaming-related IA in men, as well as an estimated prevalence rate of 3% to 6% for IA, alongside associated psychosocial impairment and comorbidity.
CBT has been suggested as a suitable treatment option for targeting dysfunctional cognitions, coping strategies, motivation, and the development of alternative activities, but previous research has shown considerable methodological limitations. To address this gap, Wölfling et al. (2019) developed the Short-term Treatment of Internet and Computer game Addiction (STICA), a manualized CBT program that combines individual and group therapy and had shown promising effects in a pilot study. Wölfling et al. (2019) designed a multicenter, randomized, observer-blind clinical trial to test the efficacy of STICA on remission and related outcomes in men with IA.
Methodology
The multicenter randomized controlled trial (RCT) was conducted in four outpatient clinics in Germany and Austria. Men aged 17–55 who had met the criteria for IA within the past six months, based on clinician-rated AICA-C and self-report AICA-S assessments, were eligible to participate. Participants were randomly assigned in a 1:1 ratio using computer-generated lists to either the STICA or wait-list control (WLC) group. Independent clinicians assessing the outcomes were blinded to treatment allocation.
STICA consisted of 15 weekly group sessions lasting 100 minutes, along with up to eight individual sessions of 60 minutes over approximately four months. The sessions were conducted by CBT therapists who had received training and regular supervision to ensure treatment fidelity. Assessments occurred at baseline (T0), mid-treatment (2 months, T1), post-treatment (4 months, T2), and a 6-month follow-up for the STICA group only (T3).
The primary endpoint was remission of IA at T2, defined as an AICA-S score of less than 7. Secondary endpoints included IA symptom severity, time spent online, psychosocial functioning, and depressive symptoms. The sample-size planning targeted 192 participants, based on pilot remission rates and an assumed 20% remission rate for the WLC group, but recruitment ultimately yielded an analyzed sample of 143 participants.
Results
Of the 149 initially randomized men, six withdrew from participation, leaving 143 participants in the analyzed sample, with 72 in the STICA group and 71 in the WLC group.
At post-treatment, remission (as measured by AICA-S) was higher in the STICA group (69.4%) compared to the WLC group (23.9%), with an adjusted odds ratio (OR) of 10.10 (95% CI, 3.69–27.65). Secondary outcome analyses also favored the STICA group, with larger reductions in self-reported IA symptoms (d = 1.19) and weekday time spent online (d = 0.88), as well as improved psychosocial functioning (GAF, d = 0.64).
Depressive symptoms improved in both groups, but the time × treatment interaction was not statistically significant. At the 6-month follow-up, 80.6% of the 36 contacted STICA participants scored below the cutoff for IA. However, only half of the original STICA group participated in this follow-up assessment. Clinician-rated outcomes measured by AICA-C also favored the STICA group, with a large effect size (d = 0.80).
Completion rates were 65.3% for STICA and 74.6% for the WLC group, with lack of adherence and missed sessions among the most common reasons for dropout.
Discussion
Wölfling et al. (2019) conclude that this is the first multicenter, observer-blind RCT to demonstrate that a manualized CBT program can achieve markedly higher remission rates and improvements in psychosocial functioning among men with IA compared to a wait-list control. The improvements reported by participants were also supported by clinician-rated assessments.
The authors also note small improvements in the WLC group, which may have been related to repeated assessment contacts and expectations of future treatment. These findings highlight the need for controlled study designs and suggest that previous pre-post studies may have overestimated treatment effects.
The study's limitations include a smaller sample size than the originally planned 192 participants, reliance on self-report measures for the primary endpoint rather than clinician-rated assessments, and male-only eligibility, which limits the generalizability of the findings to women. Furthermore, exclusion criteria based on certain comorbid mental disorders reduce the representativeness of the sample. The absence of a WLC group at the 6-month follow-up, along with the high loss to follow-up in the STICA group, also limits conclusions about the long-term effectiveness of the treatment.
Finally, Wölfling et al. (2019) recommend that future studies prioritize participant retention, include active treatment comparators, examine the potential benefits of combining CBT with pharmacological treatment, and test the effectiveness of STICA in women as well.