| Sumario: | Smartphone overuse among preschoolers is a growing concern globally. Although several studies have explored these contributing factors, the evidence specific to family-related factors influencing excessive smartphone use during preschool age remains limited. These family-related factors included parents' screen time, attitudes, mediation approach, education, employment status, family income, and household chaos. This cross-sectional study aimed to examine family-related factors that predict excessive smartphone use among preschool children. Multistage random sampling was employed to recruit 647 family caregivers. The instruments used for data collection included the Demographic Data Form, the Screen Time Questionnaire, the Mediation Scale, the Attitudes toward Smartphone Use Questionnaire, the Home Chaos Environment Questionnaire, and the Children's Smartphone Usage Habits Questionnaire. All data were collected by telephone or LINE calling interview. Descriptive statistics, correlation, and logistic regression were applied to analyze the data. The findings indicated that caregiver educational level, caregivers' weekday and weekend screen time, and caregivers' affective attitudes were significant predictors of excessive use habit, with 95% CI. The model's predictive accuracy was 56.10%. Nurses can use this finding to design interventions focusing on caregiver support strategies to promote healthy smartphone use habits among preschoolers, with further testing needed.
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