Association of the Zhejiang University index with sleep-related problems in US adults: findings from NHANES 2007-2014

Background: This study aims to investigate the precise relationship between the Zhejiang University index (ZJU index) and sleep-related problems.Methods: This study included 7920 participants from the National Health and Nutrition Examination Surveys conducted between 2007 and 2014. Logistic regression, restricted cubic spline regression, subgroup analyses and receiver operating characteristic (ROC) curve were employed to evaluate the relationship between the ZJU index and sleep-related problems