Prevalence of internet addiction and anxiety, and factors associated with the high level of anxiety among adolescents in Hanoi, Vietnam during the COVID-19 pandemic.

BACKGROUND: The COVID-19 pandemic and the resulting isolation measures created an increase in the usage of smart devices and internet among adolescents. This study aims to estimate the prevalence of internet addiction, the prevalence of high level of anxiety as well as to examine factors associated with the high level of anxiety among adolescents in Hanoi, Vietnam during the COVID-19 pandemic. METHOD: Data was collected using respondent-driven sampling and Google online survey forms from a sample of 5,325 school students aged 11-17 in Hanoi between October and December 2021. A short scale consisting of 5 items was used to measure internet addiction and the GAD-7 was used to measure adolescent anxiety level. RESULTS: The findings revealed that 22.8% and 7.32% of adolescents experienced moderate and severe anxiety. About 32.7% of the study sample exhibited at least three internet addiction indicators. Logistic regression analysis identified significant predictors for high levels of adolescent anxiety. Being female, family experiencing economic difficulties, and exposure to domestic violence were associated with higher risk of anxiety disorder (OR 1.78, 1.45, and 2.89, respectively). Both average daily online time and internet addiction demonstrated gradient association with high level of anxiety. CONCLUSION: The prevalence of internet addiction and high level of anxiety were high among adolescents in Hanoi, Vietnam during the COVID-19 pandemic. The study highlights the importance of implementing measures at the family and school levels to promote a balanced and healthy approach to smart device use among adolescents.

Online time, experience of cyber bullying and practices to cope with it among high school students in Hanoi.

This study is conducted to learn about experiences and practices to cope with cyberbullying among high school students in Hanoi and to explore the association between the average time of Internet used per day among high school students in Hanoi, Vietnam, and the risk of being cyberbullied. A total of 215 students aged 13-18 years completed an online survey using respondent-driven sampling method. The experience of being cyberbullied was examined using the modified Patchin and Hinduja's scale. The prevalence of experiencing at least one type of cyberbullying was 45.1%. The most common type of cyberbullying was being called by names/made fun of. The average daily time spent on Internet showed dose-response association with the risk of being cyberbullied. The prevalence of having experienced cyberbullying was 54% among subjects who used Internet >3 hours/day compared to 39% among those who used 1-3 hours and 30% among those who used <1 hour. In terms of practices to cope with this, most students chose to ignore it and not share information with their family or teacher. The most frequent method to overcome this problem was talking with friends (60.8%). Research shows that the prevalence of cyberbullying victimization in Hanoi was high, and student's practices to cope with this new form of bullying were not efficient. Online time had dose-response association with risk of cyberbullying. More attention is needed to increase level of society/school awareness to prevent cyberbullying in Hanoi.

Comparison of antifungal activities of Vietnamese citrus essential oils.

Citrus essential oils (EOs) are volatile compounds from citrus peels and widely used in perfumes, cosmetics, soaps and aromatherapy. In this study, inhibition of citrus EOs extracted from Vietnamese orange (Citrus sinensis), mandarin (Citrus reticulata Blanco), pomelo (Citrus grandis Osbeck) and lime (Citrus aurantifolia Swingle) on the growth of plant pathogenic fungi, Mucor hiemalis, Penicillium expansum and Fusarium proliferatum was investigated. The EOs of the citrus peels were obtained by cold-pressing method and the antifungal activity of EOs was evaluated using the agar dilution method. The results show that the EOs had significant antifungal activity. Lime EO was the best inhibitor of M. hiemalis and F. proliferatum while pomelo EO was the most effective against P. expansum. These results indicate that citrus EOs can be used as antifungal natural products in the food, pharmaceutical and cosmetic industries.