Conclusion
The “DajeongDagam,” a tailored mHealth parenting program to improve early childhood healthcare, effectively improved health-promoting behaviors, eHealth literacy, and family strength among marriage immigrant women. Moreover, we also confirmed that using LHWs for additional interpersonal support for utilizing the mHealth application produced sustained behavioral changes well beyond the conclusion of the intervention. Future studies are needed to further enhance our understanding about mHealth interventions directed at vulnerable populations. In concluding this study, several pivotal insights emerged. Firstly, the significance of a comprehensive and meticulous examination of the target population cannot be overstated. For interventions aimed at vulnerable groups, such as married immigrants, understanding the distinct characteristics and challenges of this demographic is crucial. Our rigorous analysis enabled the creation of finely tailored messages, thereby enhancing their effectiveness. Secondly, technological interventions, notably eHealth and mHealth platforms, while promising, demand caution in deployment among vulnerable populations. Absent immediate supporting mechanisms — exemplified by Lay Health Workers (LHWs) in our scenario — the effectiveness of such programs can be jeopardized. In light of these findings, it becomes evident that to ensure sustained behavioral changes post-intervention, continued interpersonal resources are indispensable. This ensures the longevity of positive outcomes, cementing the initial benefits introduced by the program.