Browsing by Author "Paul, Christopher"

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    GIS-based Association Between PM10 and Allergic Diseases in Seoul: Implications for Health and Environmental Policy.
    (Allergy Asthma Immunol Res, 2016-01) Seo, Sungchul; Kim, Dohyeong; Min, Soojin; Paul, Christopher; Yoo, Young; Choung, Ji Tae
    PURPOSE: The role of PM10 in the development of allergic diseases remains controversial among epidemiological studies, partly due to the inability to control for spatial variations in large-scale risk factors. This study aims to investigate spatial correspondence between the level of PM10 and allergic diseases at the sub-district level in Seoul, Korea, in order to evaluate whether the impact of PM10 is observable and spatially varies across the subdistricts. METHODS: PM10 measurements at 25 monitoring stations in the city were interpolated to 424 sub-districts where annual inpatient and outpatient count data for 3 types of allergic diseases (atopic dermatitis, asthma, and allergic rhinitis) were collected. We estimated multiple ordinary least square regression models to examine the association of the PM10 level with each of the allergic diseases, controlling for various sub-district level covariates. Geographically weighted regression (GWR) models were conducted to evaluate how the impact of PM10 varies across the sub-districts. RESULTS: PM10 was found to be a significant predictor of atopic dermatitis patient count (P<0.01), with greater association when spatially interpolated at the sub-district level. No significant effect of PM10 was observed on allergic rhinitis and asthma when socioeconomic factors were controlled for. GWR models revealed spatial variation of PM10 effects on atopic dermatitis across the sub-districts in Seoul. The relationship of PM10 levels to atopic dermatitis patient counts is found to be significant only in the Gangbuk region (P<0.01), along with other covariates including average land value, poverty rate, level of education and apartment rate (P<0.01). CONCLUSIONS: Our findings imply that PM10 effects on allergic diseases might not be consistent throughout Seoul. GIS-based spatial modeling techniques could play a role in evaluating spatial variation of air pollution impacts on allergic diseases at the sub-district level, which could provide valuable guidelines for environmental and public health policymakers.
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    The Academic and Social Impact of COVID-19 Among College Students: Perspectives from the United States of America, Cameroon, Ghana, and Nigeria
    (International Journal of Higher Education) Kaninjing, Ernest; Lopez, Ivette A; Wankie, Che; Akin Odanye, Elizabeth O; Ndip, Roland N; Dokurugu, Yussif M; Tendongfor, Nicholas; Amissah, Felix; Means, Shelley White; Paul, Christopher; Sauls, Derrick L; Vilme, Helene
    The novel coronavirus disease of 2019 (COVID-19) caused disruptions in the delivery of higher education around the globe. To understand how universities and students are dealing with the sudden change from in-person course delivery to online format, this cross-sectional mixed-method study aimed to (a) ascertain the impact of the COVID-19 pandemic on students’ ability to access online learning; (b) examine how college students adapted to changes in the learning/teaching environment; and (c) explore the students’ perspective on measures that institutions of higher learning could have adopted to ease the abrupt transition to online learning. Results indicate a majority of participants in the US reported access to internet and computers for off-campus learning during the COVID-19 pandemic. A little over half of participants from Africa reported internet access during the COVID-19 pandemic (82% of participants from Nigeria and 66.7% from Ghana). Participants from Cameroon reported the lowest percentage of access to online learning at 59.1%. Participants from Africa reported challenges in adapting to online format due to inadequate access to necessary technological resources such as a reliable internet and computer. Participants identified internal and external resources that could have been adopted to better deal with the transition to online learning. Institutions of higher learning can learn from their initial response to the COVID-19 pandemic to formulate and adjust policies that provide flexibility to effectively transition to online learning while catering to the social, educational and health needs of their students.
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    The effect of non-fluoride factors on risk of dental fluorosis: Evidence from rural populations of the Main Ethiopian Rift
    (Science of the Total Environment, 2014-08-01) Kravchenko, Julia; Rango, Tewodros; Akushevich, Igor; Atlaw, Behailu; McCornick, Peter G; Merola, R Brittany; Paul, Christopher; Weinthal, Erika; Harrison, Courtney; Vengosh, Avner; Jeuland, Marc
    Elevated level of fluoride (F-) in drinking water is a well-recognized risk factor of dental fluorosis (DF). While considering optimization of region-specific standards for F-, it is reasonable, however, to consider how local diet, water sourcing practices, and non-F- elements in water may be related to health outcomes. In this study, we hypothesized that non-F- elements in groundwater and lifestyle and demographic characteristics may be independent predictors or modifiers of the effects of F- on teeth. Dental examinations were conducted among 1094 inhabitants from 399 randomly-selected households of 20 rural communities of the Ziway-Shala lake basin of the Main Ethiopian Rift. DF severity was evaluated using the Thylstrup-Fejerskov Index (TFI). Household surveys were performed and water samples were collected from community water sources. To consider interrelations between the teeth within individual (in terms of DF severity) and between F- and non-F- elements in groundwater, the statistical methods of regression analysis, mixed models, and principal component analysis were used.About 90% of study participants consumed water from wells with F- levels above the WHO recommended standard of 1.5mg/l. More than 62% of the study population had DF. F- levels were a major factor associated with DF. Age, sex, and milk consumption (both cow's and breastfed) were also statistically significantly (p<0.05) associated with DF severity; these associations appear both independently and as modifiers of those identified between F- concentration and DF severity. Among 35 examined elements in groundwater, Ca, Al, Cu, and Rb were found to be significantly correlated with dental health outcomes among the residents exposed to water with excessive F- concentrations.Quantitative estimates obtained in our study can be used to explore new water treatment strategies, water safety and quality regulations, and lifestyle recommendations which may be more appropriate for this highly populated region. © 2013 Elsevier B.V.