Feasibility of Integrating a Standardized Psychosocial Follow-Up After Childhood Cancer-An Interim Analysis of the LE-Na Study.

Equipped with high‐speed Internet and innovative applications, smartphones have become indispensable to nearly every facet of modern life. In fact, as of 2025, there were 5.8 billion smartphone users worldwide, representing a global penetration rate of 70% (Kemp ). Importantly, smartphones are designed to adapt to individuals' needs: As a highly personalized technology, smartphones can offer entertainment, information, and resources that fit the unique psychological, cognitive, and social needs of each user (Ratan et al. ; Yang et al. ). Not surprisingly, smartphone use continues to surge, with emerging research documenting patterns of problematic use (Ratan et al. ; Wacks and Weinstein ). Problematic smartphone use refers to excessive engagement with smartphones, typically accompanied by impaired daily functioning (e.g., interference with planned work), emotional dysregulation (e.g., impatience or distress when not being able to use smartphones), uncontrollable urges to use smartphones (e.g., repeated checking even without notification), and a preference for smartphone use over other meaningful activities, such as seeking personal fulfillment, walking in nature, and talking to someone in person (Busch and McCarthy ; Ratan et al. ). Given smartphones' ability to deliver extensive, instant, and personalized gratification, problematic smartphone use is prevalent. Based on 20 studies involving 12,462 participants from 10 countries, a meta‐analytic review (Humood et al. ) found that more than 70% of participants experienced moderate to severe addiction‐like symptoms, such as nomophobia and dependency when disconnected from their devices. As parents are primary socializers of children, parents' use of smartphones has emerged as a key area of investigation (Frackowiak, Ochs, et al. ; Frackowiak, Oleszkowicz, and Łockiewicz ). Indeed, surveys indicated that, on average, parents in Japan, Thailand, and the U.S. spend about 2.2 h, 3.2 h, and 3.9 h on smartphones per day, respectively (Chaibal and Chaiyakul ; Lu et al. ; Yuan et al. ). Furthermore, studies with Chinese and Korean parents found that about 10%–23% of participating mothers were at risk for addictive smartphone use (Kim et al. ; Lam and Chung ). Compared to adolescents, children spend substantially more time with their parents (Lam and McHale ). Therefore, it is important to examine the potential implications of parents' use of smartphones for their parenting behaviors during childhood (Beamish et al. ).