Relationships between sleep duration and suicidal behaviors in Chinese adolescents: results from Zhejiang childhood behavior and health cohort.

Asthma, the most common chronic respiratory disease among youth worldwide, is associated with considerable morbidity and mortality. Poorly controlled asthma has a significant burden on quality of life, negatively impacting youth mental health, academic performance, and sleep. When persistent or under-treated, pediatric asthma can contribute to the burden of disease in adulthood, with recent evidence linking childhood asthma and adverse lung-function trajectories to long-term cardiovascular and respiratory complications. It is well established that secondhand smoke exposure (SHSe) from combustible tobacco products is associated with poor asthma control in youth, including exacerbated symptoms and asthma medication use, worse pulmonary function, and increased asthma-related healthcare utilization. A significant source of SHSe among children is caregiver smoking at home, making SHS an important modifiable risk factor for pediatric asthma. Despite this, there is a dearth of research systematically reviewing interventions targeting this factor. Previous reviews have focused on children in general and not specially on those with asthma; of these, only one review includes a study on asthma, and the impact of the intervention on asthma was not synthesized. Other reviews have focus on indoor environmental pollutants more broadly. To the best of our knowledge, no review has evaluated the impact of caregiver-focused household SHSe interventions on pediatric asthma outcomes, representing a critical knowledge gap. This study aims to systematically review and qualitatively synthesize the literature on the impact of interventions to reduce SHSe in households on pediatric asthma outcomes.