Geography
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Item Spatial association between environmental noise levels and occurrence of children hearing impairments in Ibadan metropolis, Nigeria(2015) Oguntoke, O.; Olatinwo, M.; Taiwo, O. J.Reports in the past few decades indicate that Nigerian cities have high noise levels that is claimed to impact the health of residents negatively. The present article therefore examine the relationship between levels of environmental noise in selected residential areas in Ibadan metropolis with varying reported cases of hearing impairments (HI). Data on cases of HI were collected from one hospital; noise monitoring was conducted with the aid of a noise level meter while copies of questionnaire were administered to residents to elicit information on public perception. The distribution of reported cases of HI among residential areas in Ibadan city showed varying magnitude (p < 0.001). About 75 % of children diagnosed with HI cases were within ages of 4-12 and female children suffered more (53.9 %). Sensorineural and conductive impairments accounted for 88.2 % of all reported HI cases. Monitored noise levels vary significantly among the selected residential area at each of morning, after-noon and evening (p < 0.05). Noise levels at morning and evening showed significant correlation with cases of HI reported at each of the 10 selected residential areas (r = 0.81; 0.82). Regression analysis showed that noise level explained 70.1 % of the spatial pattern of HI cases. Residents indicated that their neighbourhoods were noisy, that noise levels were on the increase and that ceremonies and generator use were major sources of noise. An integrated strategy for noise control is urgently required to stem the tide of noise pollution so as to safeguard human health in Nigerian cities.Item Geograpic information systems in determining road traffic crash analysis in Ibadan, Nigeria(2014-09) Rukewe, A.; Taiwo, O. J.; Fatiregun, A. A.; Afuwape, O. O.; Alonge, T. O.Background: Road traffic accidents are frequent in this environment, hence the need to determine the place of geographic information systems in the documentation of road traffic accidents. Aim & Objectives: To investigate and document the variations in crash frequencies by types and across different road types in Ibadan, Nigeria. Materials & Methods: Road traffic accident data between January and June 2011 were obtained from the University College Hospital Emergency Department's trauma registry. All the traffic accidents were categorized into motor vehicular, motorbike and pedestrian crashes. Georeferencing of accident locations mentioned by patients was done using a combination of Google Earth and ArcGIS software. Nearest neighbor statistic, Moran's-I, Getis-Ord statistics, Student T-test, and ANOVA were used in investigating the spatial dynamics in crashes. Results: Out of 600 locations recorded, 492 (82.0%) locations were correctly georeferenced. Crashes were clustered in space with motorbike crashes showing greatest clustering. There was significant difference in crashes between dual and non-dual carriage roads (P = 0.0001), but none between the inner city and the periphery (p = 0.115). However, significant variations also exist among the three categories analyzed (p = 0.004) and across the eleven Local Government Areas (P = 0.017). Conclusion: This study showed that the use of Geographic Information System can help in understanding variations in road traffic accident occurrence, while at the same time identifying locations and neighborhoods with unusually higher accidents frequency.Item The August 2011 flood in Ibadan, Nigeria: anthropogenic causes and consequences(Springer, 2012) Agbola, B. S.; Ajayi, O.; Taiwo, O. J.; Wahab, B. W.Determining when and where flood strikes can be a daunting task. Apart from heavy and prolonged rainfalls and river overflows, there are anthropogenic causal factors of flooding. These anthropogenic factors are significantly variable and exacerbate floods, but may be difficult to measure. This study aims to unravel some of the anthropogenic factors, particularly with respect to their contributions to the flood in Ibadan City on 26 August 2011. Data were collected through structured questionnaire and key informant interviews. The August 2011 Ibadan flood was perhaps the worst in the history of this ancient city. Twelve anthropogenic factors are broadly identified as having contributed to the flood and the flood had five major consequences. Some policy implications that can help prevent future flood occurrence are outlined.Item Effect of land use, time of day and vehicle type on seat belt use in Lagos, Nigeria(2012-03) Akinyemi, Y. C.; Taiwo, O. J.; Osayomi, T.; Olaniran, H. D.The seat belt has been proven to be effective in the reduction of traffic injuries and deaths. Despite the efficacy and strict enforcement of legislation, it has been frequently underutilized in many countries including Nigeria.The aim of this study was to investigate the seat belt use rate, and determine the effect of land use types, vehicle types and time of day on observed rates in a local government area of Lagos state, Nigeria. A two-day cross-section observational survey was conducted in three observation points, The use rates by land use type, time of day and vehicle type were observed. A total of 40,753 vehicles were evaluated. In general, 43.1 percent of drivers observed used the seat belt. The highest seat belt compliance rate was observed in the residential sector (55.8%), among private cars (65.1%), and between 1.00pm and 4.00pm (44.8%). The chi-square analysis confirmed significant differences in seat belt use across three land use types (X2=609.72, p = 0.001), vehicle types (X2= 11780.31; p = 0.001) and time of day (X2- 59.86; p= 0.001). More seat belt education and stricter enforcement of the seat belt regulation were suggested to raise the level of seat belt use in concerned areas, vehicle types and at the affected time intervals.Item Perceived causes, exposures and adjustments to seasonal heat in different residential areas in Ibadan, Nigeria(Springer, 2012) Taiwo, O. J.; Olaniran, H. D.; Osayomi, T.Local perception can be an important resource for assessing and managing climate-related extremes and identifying adjustment strategies unique to specific settings. The objectives of the study are two-fold. Firstly, it examined the perceived causes, exposures and adjustments to seasonal heat events using different residential density areas of Ibadan, Nigeria, as spatial units of analysis. Secondly, it investigated the relationship between heat exposure, built environment, socio-economic and cultural factors. Results show that intense heat from the sun, climate change and absence of rains, among others, was identified as perceived causes. Number of electricity hours, distance from water supply points and the number of neighborhood trees were listed as the three most important factors affecting heat exposure. In addition, there were considerable variations in the perceived causes (F = 4.86, p<0.05), in exposures (F = 3.61, p<0.05), and in adjustments to seasonal heat (F = 8.75, p<0.05) across different residential density areas in Ibadan, Nigeria. The study demonstrates that local knowledge based on the perceptions, exposures and adjustments to seasonal heat waves has the potential in some cases to provide valid inputs into vulnerability and adaptation assessments.Item Determining the vulnerability of states in Nigeria to COVID-19(2020) Addie, O.; Taiwo, O.; Seun-Addie, K.The impact of the coronavirus disease 2019 (COVID-19) pandemic has been felt globally. However, against the backdrop of the uncertainties surrounding the pandemic, and the pronouncement of the World Health Organization that the virus may never go away, it has become pertinent for nations to identify and protect the most vulnerable of their citizens. This study determined the states with the highest vulnerability to the pandemic in Nigeria. The 2006 population data for each state of the federation was obtained from the National Population Commission (NPC) Nigeria, and was projected to the year 2020. Data on: Nigerians aged 60 years and older, the percentage population in the lowest and second wealth quantiles, percentage population without fixed handwashing and moderate handwashing facilities, and percentage population of male and female without exposure to mass media, were obtained from the 2018 Nigeria Demographic and Health Survey report. Prevalence rates of High Blood Pressure, Diabetes Mellitus, Cardiovascular Disease, and Asthma were extracted from literature. These were used to estimate a vulnerability score for each state of the federation and the Federal Capital Territory. Kebbi had the highest score (39.82), followed by Zamfara (39.27) and Sokoto (39.24), respectively. Osun (11.45), Abia (12.53), and Lagos (15.47), have the least scores, respectively. The most vulnerable geo-political zone was the Northwest, while the least vulnerable was the Southwest. Regression analysis was carried out to model the data. Appropriate steps should be taken to reduce likely mortalities due to high vulnerability to COVID-19 in the identified States.Item Tobacco use and the risk of catastrophic healthcare expenditure(2018) Adeniji, F.; Lawanson, O.BACKGROUND: Tobacco consumption increases the chance that an individual will suffer from illhealth. Financial cost associated with increased demand for medical care can be substantial and catastrophic, especially for households in the lowest income stratum. This paper extends what is known about the poverty impact of tobacco use by estimating the increased risk of incurring higher catastrophic health expenditure because of tobacco consumption. METHODS: The data for the study were drawn from the Harmonized Nigerian Living Standard Survey (HNLSS) conducted in 2009/2010 by the National Bureau of Statistics. Three log-linear models of health expenditures were used to predict the health expenditure attributable to tobacco consumption. The incidence of catastrophic health expenditure (CHE) was estimated using the standard 40-percent threshold of household total nonfood expenditure. RESULTS: Based on the three log-linear regression models, smokers had higher health expenditure compared to non-smokers (by 43.91%, 33.23% and 41.51%). Excess average health expenditure attributable to tobacco use was the highest among moderately poor smokers (Nigerian national currency Naira (NGN) 37,734.90 (USD251)) and the lowest among non-poor smokers (NGN 7,819.78 (USD52)). In addition, extremely poor smokers incurred higher medical expenditure attributable to tobacco use compared to non-poor smokers. Among the non-poor households, 23.87% experienced CHE in the rural areas and 13.62% in the urban ones. Accounting for the predicted excess medical expenditure among smokers, there was a 3.11% increase in the burden of CHE among households living in rural location. Overall, excess medical expenditure associated with tobacco use increased the incidence of CHE among households. CONCLUSION: Essentially, smoking will aggravate the financial hardship of households because of higher burden of CHE in the short and long run. Therefore, healthcare policymakers in Nigeria can reduce the excessive financial burden attributable to smoking by developing policies that curtail tobacco consumption. Evidence provided in this study supports this.Item The inversion of geoelectrical data for hydrogeological applications in crystalline basement areas of Nigeria(ELSEVIER, 1997) Olayinka, A.I.; Weller, A.A methodology is presented for the inversion of two-dimensional (2-D) geoelectrical data for solving hydrogeological problems in crystalline basement areas. The initial step entails compiling an earth model using all available geological, borehole and geophysical information. This model then served as the input to a 2-D inversion algorithm based on the Simultaneous Iterative Reconstruction Technique (SIRT). The algorithm tries to find a model that is as close as possible to the starting model. To demonstrate the usefulness of this procedure, two field examples from Nigeria, conducted as part of a borehole siting programme, are described. In the first example, borehole information regarding the thickness of the weathered zone overlying a gneissic bedrock was used to constrain the 1-D inversion of sounding data and the model thus compiled was used as the starting model for 2-D inversion. In the second example, only sounding information was used to determine the starting model. If the starting model has incorporated all the available information as constraints, it is generally possible to compute a model that not only fits the measured data but is also a good approximation of the subsurface geology, more so when several 2-D models can fit the same set of field measurements on account of the limitations posed by equivalence