www.mdpi.com/journal/ijerph Comments Comments on Lu et al. Association between Self-Reported Global Sleep Status and Prevalence of Hypertension in Chinese

Lu et al. [1] examined the association between sleep status and prevalence of hypertension among Chinese adults varied by age and sex, using a cross-sectional study, including 5461 Chinese (4076 of them were male) aged 18 years or above, in Kailuan communities. Lu et al. claimed that short sleep duration was associated with hypertension only among Chinese men, and was attenuated after adjustment of sleep quality. However, the current conclusion of the study remains unclear. Of note, four sub-communities were randomly selected from the Kailuan. Subjects aged 18 years or over among those four sub-communities were invited to participate in this study. According to the methods and a previous study [2], it is more likely this is an occupation-based study rather than