Stress symptoms and associated factors among adolescents in Dhaka, Bangladesh: findings from a cross-sectional study.

BACKGROUND: Stress affects adolescents' daily lives by disrupting their working capacity and begets comorbidity. This study aimed to estimate the prevalence of stress symptoms and the factors associated with these symptoms among secondary school-going adolescents in Bangladesh. METHODS: A cross-sectional study using two-stage cluster sampling was conducted. A self-administered questionnaire was given to 2355 adolescents from nine secondary schools in Dhaka, Bangladesh. Of the respondents, 2313 completed the 10-item Perceived Stress Scale (PSS-10). Sociodemographic information, self-reported body image, a modified Leisure Time Exercise Questionnaire (LTEQ), and the WHO Global Physical Activity Questionnaire (GPAQ) were used to determine the sociodemographic and lifestyle factors associated with stress symptoms among adolescents. RESULTS: Findings suggest that about 65% of adolescents experienced moderate stress symptoms, and about 9% experienced high-stress symptoms. Females (58.7%) suffered more from stress compared to males (41.3%). Age, grade, and residential setting were significantly associated with stress. Logistic regression estimates show that level of physical activity (AOR: 1.52; 95% CI:1.26-1.84), sleep dissatisfaction (AOR: 1.33; 95% CI: 1.07-1.65), and perception of self as overweight/obese (AOR: 1.46; 95% CI: 1.13-1.89) were significantly associated with stress symptoms among adolescents. CONCLUSIONS: Stress symptoms are highly prevalent among secondary school adolescents in Bangladesh. Further exploratory investigations are needed on possible intervention strategies to reduce the burden of stress among adolescents.

Regulating tobacco retail outlets in Bangladesh: retailers' views and implications for tobacco control advocacy.

BACKGROUND: Tobacco products are ubiquitously available in Bangladesh. There are currently no restrictions on who can sell tobacco products and where they are allowed to be sold. The objective of this study was to explore tobacco retailers' views regarding tobacco retail licensing (TRL) in Bangladesh. METHODS: A two-stage cluster sampling procedure was used to collect data from a representative sample of 472 tobacco retailers (97% response rate) in Dhaka city in 2018 through face-to-face interviews using a semistructured questionnaire. Data were analysed using descriptive statistics, X2 tests and logistic regression. RESULTS: The majority (79%) of the retailers reported that they would support TRL, and 68% were interested in applying for TRL if adopted. Support for TRL was higher among those with a university degree (OR 2.1, 95% CI 0.8 to 5.3) and among those with knowledge about existing tobacco control regulations (OR 1.8, 95% CI 1.1 to 2.8). Furthermore, support for TRL was significantly higher among those who believed that it would restrict tobacco retailing locations (AOR 1.9, 95% CI 1.3 to 3.0) and prevent tobacco sales to minors (AOR 3.5, 95% CI 2.2 to 5.5). CONCLUSION: This sample of tobacco retailers in Bangladesh supported TRL. TRL advocacy efforts could draw on this support.

Mathematical model for footwear upper material consumption estimation.

Appropriate material consumption estimation since the design phase for footwear fabrication is a vital issue as material costs account for a sizeable portion of the overall production cost of a pair of shoes. This paper presents a mathematical model to predict the calculation of footwear upper material consumption to improve the utilization ratio of materials through a suitable nesting map onto leather. The proposed model concentrates on the two-dimensional geometry of footwear components and the application of rich mathematical concepts. The model reflects the outlines of individual footwear components while determining the area using definite integral calculus. Five distinct rotational kinds are applied for component arrangements that correlate to the physiognomy of leather because nesting onto the leather is intractable. The simple concept of a minimal-area polygonal enclosure is applied to maximize material utilization with minimum waste. Finally, the model was verified for four consecutive Oxford footwear sizes by comparing actual upper material consumption with predicted upper material consumption. The noble contribution of this analysis is to use ImageJ software to compute upper material consumption in real case analysis through image processing techniques and separate estimation of wastes, especially the fourth waste. The results of the comparison study show that the proposed model can reduce average material requirements by 2.06 %. This minimization of waste could be beneficial in terms of economic and environmental sustainability. Therefore, this study can be applied to estimate more accurately the amount of upper material required for footwear fabrication and support better utilization of material in the footwear industry.

Fabrication and performance analysis of keratin based-graphene oxide nanocomposite to remove dye from tannery wastewater.

In recent years, nanomaterials and composites have become increasingly significant as adsorbents in the removal of dyes and phenolic contaminants from wastewater. This study presents the development and application of a keratin-based graphene oxide nanocomposite, distinguished by its enhanced biocompatibility, cost-effectiveness, and strong affinity for organic compounds, making it highly effective in reducing dyes within tannery effluent. The nanocomposite was prepared via solution casting method, with dispersibility, chemical bonding, and morphology analyzed by UV-Vis spectroscopy, FTIR, and SEM, respectively. Furthermore, investigations of the influence of several factors, such as contact time, pH, and adsorbent dosage on the optimization of the process were conducted. An observation indicated a reduction of approximately 98.8 % in dye content within 20 min, achieved through the use of an adsorbent dosage of 1.5 g/L, with the solution pH maintained at 5. Subsequently, adsorption kinetics and isotherm modelling were analyzed. The results revealed that the adsorption process follows the pseudo-second-order kinetics and Freundlich isotherm models. Hence, the adsorption could be explained as chemisorption with a multilayer adsorption mechanism. Notably, a substantial reduction in parameters such as Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) was also achieved up to 62 % and 79 %, respectively. Therefore, the developed adsorbent could be suggested as a viable candidate for eliminating dyes from the wastewater, especially from the tannery effluent.

Post-pandemic micro/nanoplastic pollution: Toward a sustainable management.

The global health crisis caused by the COVID-19 pandemic has resulted in massive plastic pollution from the use of personal protection equipment (PPE), with polypropylene (PP) being a major component. Owing to the weathering of exposed PPEs, such contamination causes microplastic (MP) and nanoplastic (NP) pollution and is extremely likely to act as a vector for the transportation of COVID-19 from one area to another. Thus, a post-pandemic scenario can forecast with certainty that a significant amount of plastic garbage combined with MP/NP formation has an adverse effect on the ecosystem. Therefore, updating traditional waste management practices, such as landfilling and incineration, is essential for making plastic waste management sustainable to avert this looming catastrophe. This study investigates the post-pandemic scenario of MP/NP pollution and provides an outlook on an integrated approach to the recycling of PP-based plastic wastes. The recovery of crude oil, solid char, hydrocarbon gases, and construction materials by approximately 75, 33, 55, and 2 %, respectively, could be achieved in an environmentally friendly and cost-effective manner. Furthermore, the development of biodegradable and self-sanitizing smart PPEs has been identified as a promising alternative for drastically reducing plastic pollution.

Facile method for the preparation of water dispersible graphene using sulfonated poly(ether-ether-ketone) and its application as energy storage materials.

A simple and effective method for the preparation of water dispersible graphene using sulfonated poly(ether-ether-ketone) (SPEEK) has been described. The SPEEK macromolecules are noncovalently adsorbed on the surface of graphene through π-π interactions. The SPEEK-modified graphene (SPG) forms an aqueous dispersion that is stable for more than six months. An analysis of the ultraviolet-visible spectra shows that the aqueous dispersion of SPG obeys Beer's law and the molar extinction coefficient has been found to be 149.03 mL mg(-1) cm(-1). Fourier transform infrared, Raman, and X-ray photoelectron spectroscopy analyses confirm successful reduction and surface modification of graphene. An atomic force microscopy (AFM) analysis reveals the formation of a single layer of functionalized graphene. Transmission electron microscopy results are also in good agreement with the AFM analysis and support the formation of single-layer graphene. SPG shows good electrochemical cyclic stability during cyclic voltammetry and charge/discharge process when used as a supercapacitor electrode. A specific capacitance of 476 F g(-1) at a current density of 6.6 A g(-1) is observed for SPG materials.

Anxiety among urban, semi-urban and rural school adolescents in Dhaka, Bangladesh: Investigating prevalence and associated factors.

BACKGROUND: Anxiety disorder is one of the emerging public health problems in many low- and middle-income countries (LMICs). Likewise, in Bangladesh, a growing number of adolescents are experiencing such symptoms though we have very limited research evidence available. The purpose of this study was to investigate the prevalence of anxiety and the factors associated with this condition among urban, semi-urban, and rural school adolescents in Bangladesh. METHODS: This cross-sectional study used a two-stage cluster sampling procedure. A self-administered questionnaire was conveyed to 2355 adolescents from nine secondary schools of Dhaka, Bangladesh. Of the respondents, 2313 completed the seven-item Generalized Anxiety Disorder (GAD-7). Besides, sociodemographic information, self-reported body image as well as modification of Leisure Time Exercise Questionnaire (LTEQ) and WHO Global PA Questionnaire (GPAQ) were used to determine the sociodemographic and lifestyle factors associated with anxiety among adolescents. RESULTS: A total of 20.1% of adolescents were experiencing moderate to severe anxiety; of them, a significantly higher proportion (49.9%) of female adolescents were suffering more than males (40.1%). Furthermore, age, student's grade, father's educational level, number of family members, and residential setting were found to be significantly associated with anxiety among adolescents. In terms of lifestyle factors, irregular physical activity (AOR: 1.31; 95% CI: 1.05-1.63), high screen time (AOR: 1.51; 95% CI:1.21-1.88), sleep dissatisfaction (AOR: 3.79; 95% CI: 3.02-4.76), and underweight body image (AOR: 2.37; 95% CI:1.70-3.28) were found to be significantly associated with anxiety among school adolescents of urban, semi-urban, and rural residential settings. CONCLUSIONS: Anxiety is prevalent among urban, semi-urban, and rural school adolescents in Dhaka, Bangladesh. To lessen this prevalence of anxiety among Bangladeshi adolescents, evidence-based health programs- healthy school trials-and policies should therefore be taken based on the findings of this study.

Investigating the prevalence of and factors associated with depressive symptoms among urban and semi-urban school adolescents in Bangladesh: a pilot study.

BACKGROUND: Adolescent depression is an alarming issue for Bangladesh since a large number of Bangladeshi adolescents suffer from depression but cannot get proper treatment. This study aimed to investigate the prevalence of depression and factors associated with this psychological health hazard among urban and semi-urban adolescents of the Dhaka region in Bangladesh. METHODS: A cross-sectional pilot study was performed among 311 adolescents, grades 8-10, in Dhaka city and Savar Upazila, adjacent to the city, in 2018. Data were collected using a questionnaire consisting of items on sociodemographics, lifestyle information, screen-based sedentary behaviour (SBSB) and mental health. RESULTS: A total of 36.6% of the adolescents reported depressive symptoms, with a greater prevalence among females (42.9%) than males (25.7%). Sociodemographic factors including being female, residence and grade in school were significantly associated with depression. Logistic regression analysis showed that SBSBs, such as the use of social media (odds ratio [OR] 2.06 [95% confidence interval {CI} 1.27-3.35]), high screen time (>120 min/day; OR 2.35 [95% CI 1.30-4.25]) and sleep disturbance (OR 3.93 [95% CI 2.37-6.50]) were significantly linked with depressive symptoms. CONCLUSIONS: Depressive symptoms are prevalent among urban and semi-urban adolescents of Dhaka, Bangladesh. Therefore, urgent initiatives should be taken to curb the spread of depression among Bangladeshi adolescents.

Detection and removal of microplastics in wastewater: evolution and impact.

The pervasiveness of microplastics in aquatic ecosystems has become a major environmental issue in recent years. The gradual dumping of plastic wastes, inadequate standard detection methods with specific removal techniques, and slow disposal rate of microplastics make it ubiquitous in the environment. Evidence shows that microplastics act as a potential vector by adsorbing different heavy metals, pathogens, and other chemical additives widely used in different raw plastic production. Microplastics are ingested by aquatic creatures such as fish and different crustaceans, and finally, people ingest them at the tertiary level of the food chain. This phenomenon is responsible for blocking the digestion tracts, disturbing the digestive behavior, finally decreasing the reproductive growth of entire living organisms. Because of these consequences, microplastics have become an increasing concern as a newly emerging potential threat, and therefore, the control of microplastics in aquatic media is required. This paper provides a critical analysis of existing and newly developed methods for detecting and separating microplastics from discharged wastewater, which are the ultimate challenges in the microplastic treatment systems. A critical study on the effect of microplastics on aquatic organisms and human health is also discussed. Thus, this analysis provides a complete understanding of entire strategies for detecting and removing microplastics and their associated issues to ensure a waste discharge standard to minimize the ultimate potential impact in aquatic environments.

Depressive Symptom and Associated Factors Among School Adolescents of Urban, Semi-Urban and Rural Areas in Bangladesh: A Scenario Prior to COVID-19.

Background: The purpose of this study was to investigate the prevalence of depressive symptom and the factors associated with this condition among urban, semi-urban and rural adolescents in the Dhaka district of Bangladesh. Methods: A cross sectional study using two stage cluster sampling procedure was performed. A self-administered questionnaire was conveyed to 2,355 adolescents from nine secondary schools of Dhaka district of Bangladesh. Of the respondents, 2,313 completed the nine item Patient Health Questionnaire (PHQ-9). Besides, sociodemographic information, self-reported body image as well as modification of Leisure Time Exercise Questionnaire (LTEQ) and WHO Global PA Questionnaire (GPAQ) were used to determine the sociodemographic and lifestyle factors associated with depressive symptom among adolescents. Results: A total of 30.1% adolescents were found to be suffering from moderate to severely severe depressive symptom. Females (60.8%) were found suffering significantly more than males (39.2%). Sociodemographic factors, for example, residential setting and family size were found significantly associated with depressive symptom among adolescents. Adjusted estimate of logistic regression shows that physical inactivity (AOR: 1.44; 95% CI: 1.14-1.84), >2 h/day screen time (AOR: 1.68; 95% CI: 1.39-2.03), sleep dissatisfaction (AOR: 3.23; 95% CI: 2.64-3.96), and underweight body image perception (AOR: 2.30; 95% CI: 1.70-3.13) were significantly associated with depressive symptom among adolescents. Conclusions: Among urban, semi-urban and rural school adolescents in Dhaka, Bangladesh, depressive symptom is quite prevalent. To lessen the spread of depressive symptom among Bangladeshi adolescents, urgent steps should therefore be taken.

Self-perception of physical health conditions and its association with depression and anxiety among Bangladeshi university students.

BACKGROUND: Self-perception of physical health conditions is associated with depression and anxiety. Although some recent studies revealed a high prevalence of depression and anxiety among Bangladeshi university students, no study has yet investigated the link between self-perception of physical health and these common psychological disorders. Therefore, this study aimed to explore the association of self-perception of physical health conditions with depression and anxiety among university students in Dhaka, Bangladesh. METHODS: A cross-sectional study was conducted between August and November 2017 among 897 undergraduate students of Jahangirnagar University, Dhaka through face-to-face interviews using a semi-structured questionnaire. Chi-square test and binary logistic regression analysis were used to examine the association between the variables. RESULTS: 13.9% of the respondents had poor self-rated health (SRH) and 49.9% had self-rated body image (SRBI) dissatisfaction. 25.6% of the students reported to be overweight/obese whereas 18.7% to be underweight. Poor and moderate SRH was found to be significantly associated with students' depression (adjusted odds ratio [AOR]: 6.700; 95% CI: 3.821-11.749 and AOR: 2.155; 95% CI: 1.582-2.934) and anxiety (AOR: 4.365; 95% CI: 2.599-7.332 and AOR: 1.776; 95% CI: 1.270-2.484). Furthermore, SRBI dissatisfaction, underweight SRBI, overweight/obese SRBI, low blood pressure and hypertension were also significantly linked with students' depression and anxiety. CONCLUSION: Students dissatisfied with their physical health status had higher chances to suffer from depression and anxiety. The findings of this study would create room for further research and could be used to design a comprehensive health program for young students.

Impacts of socio-cultural environment and lifestyle factors on the psychological health of university students in Bangladesh: A longitudinal study.

BACKGROUND: The psychological health of university students is an issue of utmost concern worldwide. Its consequences include multifaceted outcomes from complex interactions of sociocultural, environmental, and individual lifestyle factors. This research explores the impacts of socio-cultural environment and lifestyle factors on the psychological health of university students in Dhaka, Bangladesh. METHODS: A 15-month follow-up was carried out among 1140 university students from April 2016 to November 2017. Data were collected by using a pre-developed questionnaire, consisting of socio-demographic information, comprehensive lifestyle information, and psychological health information including a nine-item scale, the Patient Health Questionnaire-9 (PHQ-9) for assessing the level of depression, and a 7-item scale, the Generalized Anxiety Disorder-7 (GAD-7) for assessing the level of anxiety. The collected data were analyzed by using the Statistical Package for Social Sciences (SPSS) software, version 22. RESULTS: With time, there was a 22.5% increase in the prevalence of provisional depression and a 27.1% increase in the prevalence of anxiety. In terms of demographic factors, findings revealed that students dissatisfied with university culture were significantly more likely to experience depression (B = 5.13, p<0.01, ß=0.33) and anxiety (B = 4.69, p<0.01, ß=0.34). 'Being female', 'being students of social sciences faculty', 'dissatisfaction with current education, financial condition and future career' were found to be significant predictors of students' psychological disorders. In terms of lifestyle factors, participants with high and excessive recreational screen time were significantly more vulnerable to depression (B = 1.25, p<0.01, ß=0.097 and B = 1.75, p<0.01, ß=0.12) and anxiety (B = 0.86, p = 0.02, ß=0.08 and B = 1.22, p<0.01, ß=0.096). Additionally, 'weekly physical inactivity', 'dissatisfaction with daily sleep', 'short and long sleep duration', 'low and high daily meal intake frequency' and 'alcohol consumption' were inextricably linked with students' depression and anxiety. CONCLUSION: The prevalence of provisional as well as major depressive and anxiety disorders among university students in Bangladesh is significantly high and augmented in nature. This study provides significant information about the adverse impacts of university socio-cultural environment and students' lifestyle factors on their psychological health conditions.