Rev Epidemiol Sante
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Rev Epidemiol Sante · Aug 2009
[Tobacco consumption among young adults in the two French departments of Savoie in 2008].
As a result of tobacco control measures in France, smoking among adolescents is decreasing. However, this decrease is associated with changes in the way youth are consuming tobacco and turning towards new tobacco products: cheaper forms of tobacco such as rolling or chewing tobacco, or fashionable forms such as narghile. The aim of this study is to describe in young adults: (1) prevalence of tobacco use and main risk factors of daily smoking, (2) the entry mode for tobacco use and (3) prevalence and main risk factors related to "chewing tobacco" used as snuff. ⋯ As found in national studies, cigarette smoking is declining among young adults, but the use of other tobacco products (narghile, chewing tobacco) is emerging. The relatively high consumption rate and the risk factors of chewing tobacco need to be examined in depth in order to organize prevention programs for young adults.
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Rev Epidemiol Sante · Aug 2009
[Application of detecting and taking overdispersion into account in Poisson regression model].
Researchers often use the Poisson regression model to analyze count data. Overdispersion can occur when a Poisson regression model is used, resulting in an underestimation of variance of the regression model parameters. Our objective was to take overdispersion into account and assess its impact with an illustration based on the data of a study investigating the relationship between use of the Internet to seek health information and number of primary care consultations. ⋯ Different methods exist to solve the problem of underestimating variance in the Poisson regression model when overdispersion is present. The negative binomial regression model seems to be particularly accurate because of its theorical distribution ; in addition this regression is easy to perform with ordinary statistical software packages.