Substance use is a common public health problem among adolescents in low- and middle-income countries (LMICs), however, factors that are associated with this condition are not clearly understood. The aim of the present study was to examine personal and interpersonal factors that contribute to risk for substance use among adolescents in six ASEAN (Association of Southeast Asian Nations) LMICs (i.e., Indonesia, Laos, Malaysia, Myanmar, Philippines and Thailand). Data of 57,825 adolescents (52.64% girls; median age = 14 years old) who participated in the Global School-based Student Health Survey (GSHS) were analysed. After the weighted prevalence was estimated for each country, multilevel models were employed to examine the influence of the risk factors on the prevalence of substance use across the countries. The results indicated a high prevalence of substance use among adolescents in all these six ASEAN LMICs. Alcohol use, smoking and drug use were more prevalent among adolescents in Thailand, Laos and Philippines. Adolescents who were bullied and who had no close friends had a high prevalence of alcohol and drug use. Problematic drinking and smoking were more prevalent among older adolescents, and smoking and drug use were more prevalent among boys. Furthermore, frequent worry, loneliness and regular physical activity were found to predict adolescents' heavy and binge drinking. This study contributed to knowledge on risk factors for specific substance use among adolescents and drew attention for the urgent need to strengthen the intervention, law policies and professional support for reducing substance use in ASEAN LMICs.
How lightning initiates inside thunderclouds remains a major puzzle of atmospheric electricity. By monitoring optical emissions from thunderstorms, the Atmosphere-Space Interactions Monitor (ASIM) onboard the International Space Station is providing new clues about lightning initiation by detecting Blue LUminous Events (BLUEs), which are manifestations of electrical corona discharges that sometimes precedes lightning. Here we combine optical and radio observations from a thunderstorm near Malaysia to uncover a new type of event containing multiple optical and radio pulses. We find that the first optical pulse coincides with a strong radio signal in the form of a Narrow Bipolar Event (NBE) but subsequent optical pulses, delayed some milliseconds, have weaker radio signals, possibly because they emanate from a horizontally oriented electrical discharges which does not trigger full-fledged lightning. Our results cast light on the differences between isolated and lightning-initiating electrical discharges.