Fig. 7

Path diagram illustrating the mediation analysis of the relationship between sleep time and stroke risk across various years. The graphs (A–C) correspond to the 2018 CHARLS database; (D–F) to the 2020 CHARLS database; (G–I) to the 2017–2020.03 NHANES database; and (J–L) to the 2021.08–2023.08 NHANES database, each depicting the mediating effects of hypertension, dyslipidemia, and diabetes, respectively