- 著者
- Miao-Miao Liu Da Wang Yang Zhao Yu-Qin Liu Mei-Meng Huang Yang Liu Jing Sun Wan-Hui Ren Ya-Dong Zhao Qin-Cheng He Guang-Hui Dong
- 出版者
- Japan Epidemiological Association
- 雑誌
- Journal of Epidemiology (ISSN:09175040)
- 巻号頁・発行日
- vol.23, no.4, pp.280-287, 2013-07-05 (Released:2013-07-05)
- 参考文献数
- 36
- 被引用文献数
- 30 45
Background: Concentrations of ambient air pollution and pollutants in China have changed considerably during the last decade. However, few studies have evaluated the effects of current ambient air pollution on the health of kindergarten children.Methods: We studied 6730 Chinese children (age, 3–7 years) from 50 kindergartens in 7 cities of Northeast China in 2009. Parents or guardians completed questionnaires that asked about the children’s histories of respiratory symptoms and risk factors. Three-year concentrations of particles with an aerodynamic diameter ≤10 µm (PM10), sulfur dioxide (SO2), and nitrogen dioxides (NO2) were calculated at monitoring stations in 25 study districts. A 2-stage regression approach was used in data analyses.Results: The prevalence of respiratory symptoms was higher among children living near a busy road, those living near chimneys or a factory, those having a coal-burning device, those living with smokers, and those living in a home that had been recently renovated. Among girls, PM10 was associated with persistent cough (odds ratio [OR]PM10 = 1.44; 95% CI, 1.18–1.77), persistent phlegm (ORPM10 = 1.36; 95% CI, 1.02–1.81), and wheezing (ORPM10 = 1.31; 95% CI, 1.04–1.65). NO2 concentration was associated with increased prevalence of allergic rhinitis (OR = 1.96; 95% CI, 1.27–3.02) among girls. In contrast, associations of respiratory symptoms with concentrations of PM10, SO2, and NO2 were not statistically significant among boys.Conclusions: Air pollution is particularly important in the development of respiratory morbidity among children. Girls may be more susceptible than boys to air pollution.
- 著者
- Jing Sun Zhaoying Li Yan Li Dongfeng Zhang
- 出版者
- Japan Epidemiological Association
- 雑誌
- Journal of Epidemiology (ISSN:09175040)
- 巻号頁・発行日
- pp.JE20200003, (Released:2020-04-11)
- 参考文献数
- 62
- 被引用文献数
- 9
Background: Epidemiological evidence on the relationships between different categories of vegetables and fruits and depressive symptoms is very limited and inconsistent, especially with no evidence from the general population. This study aimed to estimate their relationships among a large general population.Methods: The cross-sectional design was based on the National Health and Nutrition Examination Survey (2007–2014) and included 16925 adults. Dietary information was attained from two nonconsecutive 24-h dietary recalls. Patient Health Questionnaire was applied for measuring depressive symptoms. The associations between vegetables and fruits intakes and depressive symptoms were appraised utilizing logistic regression and restricted cubic spline.Results: Compared with the lowest category, the most adjusted odds ratios (95% confidence intervals, CI) of depressive symptoms for the highest category of tomatoes and tomato mixtures were 0.81 (95% CI, 0.66-0.99), and 0.64 (95% CI, 0.48-0.85) for dark-green, 0.67 (95% CI, 0.53-0.84) for other vegetables, 0.48 (95% CI, 0.29-0.79) for berries, 0.67 (95% CI, 0.55-0.82) for total vegetables, and 0.70 (95% CI, 0.57-0.86) for total fruits, and for the medium categories of bananas and dried fruits were 0.62 (95% CI, 0.41-0.95) and 0.39 (95% CI, 0.19-0.81), respectively. After sensitivity analysis by further excluding subjects with co-morbid health conditions, these findings remained significant, except for bananas. An L-shaped relationship was observed between depressive symptoms and total vegetables, while the association was linear with total fruits.Conclusions: Intakes of tomatoes and tomato mixtures, dark-green, other vegetables, berries, dried fruits, total vegetables, and total fruits were inversely related to depressive symptoms among adults.
- 著者
- Xianda Kong Hisashi Yamamoto Jing Sun Masayuki MATSUI
- 出版者
- Japan Management Training Center
- 雑誌
- Innovation and Supply Chain Management (ISSN:21870969)
- 巻号頁・発行日
- vol.10, no.2, pp.61-67, 2016-06-30 (Released:2016-12-21)
- 参考文献数
- 32
In uncertain cases, the result and efficiency of a current period (or production cycle) are in?uenced not only by the risks which exist in current period but also by the risks which exist in the previous ones. What is more, the risk itself is also affected greatly by the risks which exist in the earlier periods. This kind of problem is called a limited-cycle problem with multiple periods. Normally, workers ’efficiency is different on different tasks. How can we get an optimal assignment to minimize the total expected costs? In this paper, we consider the optimal worker assignment considering two kinds of efficiency, clever or poor efficiency on tasks. The regularity will be described that n-1 workers have two clever tasks of all, 1 worker has no clever task by contrast. Also, some numerical experiments will be done to check out the regularity of the optimal assignment that each worker has two or three clever tasks.