Watanabe K.Tran T.T.T.Sripo N.Sakuraya A.Imamura K.Boonyamalik P.Sasaki N.Tienthong T.Asaoka H.Iida M.Nguyen Q.T.Nguyen N.T.Vu S.T.Ngo T.T.Luyen T.T.Nguyen L.D.Nguyen N.T.V.Nguyen B.T.Matsuyama Y.Takemura Y.Nishi D.Tsutsumi A.Nguyen H.T.Kaewboonchoo O.Kawakami N.Mahidol University2024-09-072024-09-072024-01-01Journal of Medical Internet Research Vol.26 (2024)https://repository.li.mahidol.ac.th/handle/20.500.14594/101126Background: During the COVID-19 pandemic, health care professionals experienced high levels of depression. However, extant research has not highlighted effective internet-based psychological interventions to improve the mental health in this population during the pandemic. It remains unclear whether self-guided, internet-based cognitive behavioral therapy (iCBT) programs are effective in improving the mental health of health care workers during the COVID-19 pandemic. Objective: The aim of this study was to evaluate the effectiveness of a smartphone-based iCBT stress management program for reducing the depression experienced by nurses in Vietnam and Thailand. Methods: From March to April 2022, a 2-arm, parallel-group randomized controlled trial was implemented. One arm offered a 7-week self-guided iCBT program, and the other offered treatment as usual as a control arm. Full-time nurses were recruited from 6 hospitals: 2 hospitals in Vietnam and 4 hospitals in Thailand. The primary outcome of this program was the severity of depression measured by the Depression Anxiety Stress Scale-21 items. Follow-up surveys were conducted to measure the change in depression severity at 3 months (July-August 2022) and at 6 months (October-November 2022) after baseline. Mixed modeling for repeated measures was used to test the effects of the intervention compared with the control for the follow-up. Results: A total of 1203 nurses were included in this study: 602 in the intervention group and 601 in the control group. The follow-up rate at 3 and 6 months ranged from 85.7% (515/601) to 87.5% (527/602). The completion rate for the program was 68.1% (410/602). The group difference in depression was significant at the 3-month follow-up (coefficient=–0.92, 95% CI –1.66 to –0.18; P=.02) and nonsignificant at the 6-month follow-up (coefficient=–0.33, 95% CI –1.11 to 0.45; P=.41). The estimated effect sizes were –0.15 and –0.06 at the 3- and 6-month follow-ups, respectively. Conclusions: Our study shows that the smartphone-based iCBT program was effective in reducing depression at the 3-month follow-up among hospital nurses in Vietnam and Thailand during the COVID-19 pandemic. However, the effect size was small, and therefore, these results may not be clinically meaningful.MedicineArticleSCOPUS10.2196/500712-s2.0-8520273251214388871