Tobacco use and khat chewing among adolescents in Yemen: a large-scale school-based cross-sectional study.

Objective: The present study sought to assess the prevalence and determinants of tobacco use (cigarette smoking and shisha use) and khat chewing among Yemeni adolescents, and to evaluate their knowledge and attitudes toward these habits.

Methods: This school-based cross-sectional study was conducted among 13 to 19-year-old students attending middle/high schools (both private and public) across five main cities in Yemen. Data were collected using self-administered questionnaires comprising questions/items related to sociodemographic data, cigarette smoking, shisha use, khat chewing, and knowledge on and attitudes toward these habits.

The influence of COVID-19 related psychological and demographic variables on the effectiveness of e-learning among health care students in the southern region of Saudi Arabia.

Background: E-learning is a modern and flexible mode of education and is being used as an alternative to conventional mode of education during the ongoing COVID-19 pandemic. However evidence suggests that effectiveness of e-learning is influenced by many prevailing factors.

Methods: A cross sectional study aimed to evaluate health care students' perception towards implementation of e-learning was conducted for a period of 4 months, from April 2020 to July 2020.