Characteristics and Exposure

The thorough treatment of initial and boundary conditions as well as of exposure sequences in a detailed risk analysis is replaced by a representation of the phenomena based on observations. If these do not exist recourse is had to simple calculation models or a combination of model and observations. 

From the plethora of potential accident sequences a few are selected which determine to a large extent the accident sequences. In particular the following models are used  

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The best view we have from twin studies is that schizophrenia results from both genetic and shared-environment etiological influences, with shared environment meaning classical postnatal environmental factors plus prenatal environmental factors, such as exposure to infectious agents, macro- or micronutrient dietary characteristics, and exposure to environmental toxins, teratogens, and other assaults to the prenatal environment.22 Which factors and assaults are important can differ from one individual to another for reasons still unknown. Schizophrenia is not a simple puzzle. 

Characteristics and Exposure Measures. Federal Highway Administration. Report DTFH61-81-C-00020. U.S. Department of Transportation, Washington, DC. 

To compare a rate among patient groups within a hospital, over time, or across hospitals, infection control practitioners (ICPs) must adjust the rate for the variations in the major risk factors that lead to the infection. A patient s predisposition for becoming infected is strongly influenced by certain risk factors, such as personal characteristics and exposures. These risk factors are roughly divided into two categories intrinsic and extrinsic. 

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