Modelling count data: An application to a breast cancer data in Malaysia

Abdullah, Mohd Asrul Affendi; Jamil, Siti Afiqah Muhamad; Jalal, Y. M. Tengku Mardhiah Tengku

doi:10.1063/1.4965123

Cited by 2 publications

(2 citation statements)

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“…52 The negative binomial regression model fits the data better and accounted for overdispersion better than the Poisson regression model, which assumed the mean and variance were the same. 53 In addition, the residual deviance by the degree of freedom or the quotient is greater than one. Trend Analysis was done using the Cochran-Armitage trend test.…”

Section: Methodsmentioning

confidence: 99%

Prevalence and Trends of Drinking Water Disinfection Byproducts-Related Cancers in Addis Ababa, Ethiopia

Tafesse

Porcelli

Gari

et al. 2022

Environ�Health�Insights

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Background: Disinfection byproducts (DBPs) from chlorinated drinking water have been linked to an increased risk of cancer in the bladder, stomach, colon, and rectum. No studies showed the independent trends and prevalence of these cancers in Ethiopia. Therefore, this study aimed to determine the prevalence and trends of disinfection byproducts-related cancers in Addis Ababa, Ethiopia. Methods: Data were collected from the Addis Ababa Cancer Registry. Spatial data sets were produced and classified into households receiving chlorinated surface water and less chlorinated groundwater. The Cochran-Armitage trend test was used to evaluate whether there was a disinfection byproducts-related cancers (DBRCs) trend among communities receiving chlorinated water. Negative binomial regression was used to analyze the incidence rate. Results: A total of 11, 438 cancer cases were registered between 2012 and 2016, and DBRCs accounted for approximately 17%. The majority of the total cancer cases were female; 7,706 (67%). The prevalence of DBRCs was found to be higher in communities supplied with chlorinated water. From 2012 to 2016, the trend of colon cancer increased (β = 10.3, P value = .034); however, esophageal cancer decreased (β = −6.5, P value = .018). Approximately 56% of colorectal cancer patients and 53% of stomach cancer patients are known to be using chlorinated surface water for drinking regularly. In addition, approximately 57.1% and 54% of kidney and bladder cancer patients, respectively, used chlorinated surface water. Conclusion: The prevalence of DBRCs in this study was found to be high. The colon cancer trend increased substantially from 2012 to 2016. The prevalence of DBRCs was higher in communities supplied with chlorinated surface water. Similarly, the prevalence of DBRCs was higher among males than females. Further study is required to validate the association between DBRCs and water chlorination.

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Section: Methodsmentioning

confidence: 99%

Prevalence and Trends of Drinking Water Disinfection Byproducts-Related Cancers in Addis Ababa, Ethiopia

Tafesse

Porcelli

Gari

et al. 2022

Environ�Health�Insights

View full text Add to dashboard Cite

show abstract

“…In the case of Poisson overdispersion, it is recommended that one uses more flexible model such as the negative binomial (Cameron and Trivedi, 1998). Many researchers have taken this approach in analyzing similarly structured data (Anderson et al, 2014;Mutyaba et al, 2015;Abdullah et al, 2016). In this study, both Poisson and negative binomial distributions were considered for each cancer outcome.…”

Section: Methodsmentioning

confidence: 99%

Precipitation and Climate Zone Explains the Geographical Disparity in the Invasive Cancer Incidence Rates in the United States

Shah

Rieger

Pan

2019

Environmental Engineering Science

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Environmental factors such as ultraviolet radiation and pollution have been known to influence the incidence rate of cancer. However, these factors do not explain the variation in incidence rates across the United States. In this study, the hypothesis that precipitation and climate zone play a role in determining the incidence rate of invasive cancer in the United States is tested. The hypothesis was tested using the county-level cancer incidence rate data obtained from the Center for Disease Control's National Program of Cancer Registries Cancer Surveillance System. Individual generalized linear models were developed for each of the five separate cancer incidence rates, as well as total invasive cancer. Precipitation and climate zone were included in each model along with demographic variables such as annual income, population by gender, race, and age-important control variables. Results indicate that in the United States, counties with high precipitation and cold climate have statistically significantly higher rates of invasive cancer incidence rates (p < 0.05). This is the first study reporting precipitation and climate as natural environmental factors responsible for the geographical disparity in invasive cancer incidence rates within the United States.

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Modelling count data: An application to a breast cancer data in Malaysia

Cited by 2 publications

References 0 publications

Prevalence and Trends of Drinking Water Disinfection Byproducts-Related Cancers in Addis Ababa, Ethiopia

Prevalence and Trends of Drinking Water Disinfection Byproducts-Related Cancers in Addis Ababa, Ethiopia

Precipitation and Climate Zone Explains the Geographical Disparity in the Invasive Cancer Incidence Rates in the United States

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