Associations between short-term exposure to ambient temperature and renal disease mortality in Japan during 1979-2019: A time-stratified case-crossover analysis.

Background: Previous studies have indicated that renal disease mortality is sensitive to ambient temperatures. However, most have been limited to the summer season with inconclusive evidence for changes in population vulnerability over time. Objective: This study aims to examine the association between short-term exposure to ambient temperatures and mortality due to renal diseases in Japan, and how this association varied over time. Methods: We conducted a two-stage, time-stratified case-crossover study from 1979 to 2019 across 47 prefectures of Japan. We obtained the data of daily mortality counts for all renal diseases, acute renal failure, and chronic renal disease. We fitted a conditional quasi-Poisson regression model with a distributed lag nonlinear model. A random-effects meta-analysis was applied to calculate national averages. We performed additional analyses by four subperiods, sex, and age groups. Results: We analyzed 997,590 renal mortality cases and observed a reversed J-shaped association. Lower temperatures were associated with increased mortality in all renal disease categories. The cumulative relative risks at 2.5th percentile compared to the minimum mortality temperature percentile were 1.34 (95% confidence interval [CI] = 1.29, 1.40), 1.51 (95% CI = 1.33, 1.71), and 1.33 (95% CI = 1.24, 1.43) for all renal, acute renal failure, and chronic renal disease mortality, respectively. The associations were observed in individuals of both sexes and aged 65 years and above. The associations of kidney mortality with low temperature remained consistent, while the associations with high temperature were pronounced in the past, but not in recent periods. Conclusions: Protection for individuals with impaired renal function from exposure to low temperatures during cold seasons is warranted.

Prenatal exposure to environmental heavy metals and newborn telomere length: A systematic review and meta-analysis.

Exposure to environmental heavy metals is associated with telomere length (TL) alteration. Available information regarding the effect of prenatal exposure to environmental pollutants on newborn TL is controversial. The aim of this study is to systematically review and conduct a meta-analysis of the existing epidemiological studies on the associations between prenatal metal exposure and newborn TL. A comprehensive literature search was performed using the online databases of PubMed, Web of Science, and ScienceDirect from their inception to December 1, 2023. Thirteen eligible studies were included from the overall initial identification of 3559 records. The effect size was expressed as standardized beta coefficients with 95% confidence intervals (CIs) by the restricted maximum-likelihood approach with a weighted random-effects model. Prenatal exposure to environmental heavy metals was associated with a shorter newborn TL (standardized beta = -0.04; 95% CI: -0.08, 0.00; p = 0.05). Subgroup analysis showed that prenatal exposure to cadmium was significantly, negatively associated with TL in newborns (standardized beta = -0.05; 95% CI: -0.10, -0.01; p = 0.021). Heavy metal exposure during the third trimester was significantly associated with a shorter TL in newborns (standardized beta = -0.05; 95% CI: -0.11, -0.01; p = 0.045). No significant association was found between the newborn's sex and exposure sample type. This study provides evidence for the negative effect of prenatal exposure to heavy metals on newborn TL. In particular, cadmium exposure and exposure during the third trimester of pregnancy are critical factors associated with heavy metal-induced TL shortening.

Health literacy among adolescents and young adults in the Eastern Mediterranean region: a scoping review.

OBJECTIVES: For adolescents and young adults, most health literacy research has been conducted in Western countries, but few studies have been conducted in the Eastern Mediterranean region (EMR). This review aimed to explore the existing health literacy research in the EMR in addition to the levels of health literacy and its associated factors among adolescents and young adults. METHODS: The search, conducted using the PubMed/MEDLINE, EBSCOhost/CINAHL plus, Web of Science and J-STAGE databases, was initially performed on 16 June 2022 and later updated on 1 October 2022. Studies that targeted 10-25 years old persons, conducted in any of the EMR countries and that used the health literacy concept and/or described its levels or predictors were included in the review. Content analysis was used for data extraction and analysis. Data related to the study methods, participants, outcome variables and health literacy were extracted. RESULTS: The review included 82 studies, most of which were conducted in Iran and Turkey and adopted a cross-sectional design. Half of the studies showed that more than half of adolescents and young adults had low or moderate health literacy. Nine studies applied university-based or school-based health education interventions to improve health literacy, which was also predicted by demographic and socioeconomic factors and internet usage. Little attention was paid to assessing the health literacy of vulnerable people, such as refugees and those with a disability and exposed to violence. Finally, various health literacy topics were investigated, including nutrition, non-communicable diseases, media and depression. CONCLUSION: Health literacy levels were low-to-moderate in adolescents and young adults in the EMR. To promote health literacy, it is recommended to use school-based health education and attempt to reach adolescents and young adults through social media platforms. More attention should be paid to refugees, people with disabilities and those exposed to violence.

Factors associated with syndemic anemia and stunting among children in Myanmar: A cross-sectional study from a positive deviance approach.

BACKGROUND: Anemia and stunting in children are detrimental to the prospects of a normal, healthy upbringing. Having similar risk factors and serious consequences, the syndemic aspect of these two ailments is mostly underrated, and positive deviant (PD) factors that ensure non-anemic status in stunted children have not been studied to date. METHODS: This study aimed to identify PD factors that have potential to prevent syndemic anemia among stunted children aged 6-59 months in Myanmar. This was a cross-sectional secondary analysis of the Myanmar Demographic and Health Survey (DHS) data conducted in 2016, applying the PD concept, where children who were stunted without anemia were considered as PDs. RESULTS: Among 1248 stunted children, those who had the syndemic condition were compared with their PD peers in terms of maternal characteristics as well as socioeconomic and health-related factors. Multivariable logistic regression analyses were used to identify the determinants of syndemic state. The results showed that three out of every five stunted children were anemic. The syndemic risk was decreased among children of maternal age groups 20-34 years and 35-44 years: [aOR] = 0.19, 95% CI = 0.05-0.69; p = 0.012, and aOR = 0.19, 95% CI = 0.05-0.75; p = 0.018, respectively. Moderately stunted children (aOR = 0.53, 95% CI = 0.34-0.81; p = 0.004) and children who were not currently breastfed (aOR = 1.56, 95% CI = 1.01-2.41; p = 0.044) were less likely to develop the syndemic condition. CONCLUSION: Maternal age, stunting severity, breastfeeding duration, and maternal anemic status are strong predictors in determining hemoglobin concentrations among stunted children. This study suggests that nutritional interventions targeting PD factors could represent syndemic action in improving child health.

Effects of Desert Dust and Sandstorms on Human Health: A Scoping Review.

Desert dust and sandstorms are recurring environmental phenomena that are reported to produce serious health risks worldwide. This scoping review was conducted to identify the most likely health effects of desert dust and sandstorms and the methods used to characterize desert dust exposure from the existing epidemiological literature. We systematically searched PubMed/MEDLINE, Web of Science, and Scopus to identify studies that reported the effects of desert dust and sandstorms on human health. Search terms referred to desert dust or sandstorm exposure, names of major deserts, and health outcomes. Health effects were cross-tabulated with study design variables (e.g., epidemiological design and methods to quantify dust exposure), desert dust source, health outcomes and conditions. We identified 204 studies that met the inclusion criteria for the scoping review. More than half of the studies (52.9%) used a time-series study design. However, we found a substantial variation in the methods used to identify and quantify desert dust exposure. The binary metric of dust exposure was more frequently used than the continuous metric for all desert dust source locations. Most studies (84.8%) reported significant associations between desert dust and adverse health effects, mainly for respiratory and cardiovascular mortality and morbidity causes. Although there is a large body of evidence on the health effects of desert dust and sandstorms, the existing epidemiological studies have significant limitations related to exposure measurement and statistical analysis that potentially contribute to inconsistencies in determining the effect of desert dust on human health.

Ambient temperature and nervous system diseases-related mortality in Japan from 2010 to 2019: A time-stratified case-crossover analysis.

BACKGROUND: Despite the substantial disease burden caused by nervous system diseases, few studies have examined the association between ambient temperature and nervous system diseases, especially during cold seasons. Evidence for specific disease subgroups such as Alzheimer's and Parkinson's is also lacking. OBJECTIVES: This study examined the association between short-term changes in ambient temperature and nervous system diseases-related mortality in ten Japanese prefectures from 1 January 2010 to 31 December 2019. METHODS: A two-stage analysis based on a time-stratified case-crossover study design was conducted. A conditional quasi-Poisson regression model with a distributed lag non-linear model for temperature was applied followed by a multivariate random-effects meta-analysis to obtain average associations. Mortality due to all and cause-specific nervous system diseases (major neurodegenerative diseases, Alzheimer's, and Parkinson's) were analyzed, with consideration for sex and age (0-84 and 85+ years old) subgroups. RESULTS: We analyzed 162,315 death cases due to nervous system diseases. Cold was associated with all categories of nervous system diseases-related mortality, but not heat. The estimated relative risks for cold, obtained by comparing the 2.5th percentile of daily mean temperature distribution to the minimum mortality temperature (MMT), were 1.43 (95 % CI: 1.28-1.60), 1.37 (95 % CI: 1.17-1.59), 1.53 (95 % CI: 1.07-2.01), and 1.54 (95 % CI: 1.13-2.10) for all nervous system diseases, major neurodegenerative diseases, Alzheimer's, and Parkinson's, respectively. These associations were also observed in the sex and age subgroups in general but without evidence of effect modification. Heat (the 97.5th percentile of daily mean temperature distribution vs. MMT) was associated with Parkinson's disease-related mortality among those aged 85 years and over. DISCUSSION: Cold was associated with an increased risk of nervous system disease-related mortality. The effect of heat was not observed, except for mortality among the elderly aged 85 years and older with Parkinson's disease.