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A final evaluation of members' declaration of activities and affiliations was carried out prior to acceptance of members to the Expert Committee for the purpose of determining whether any bias or conflict with the mandate of the Expert Committee was present.Īs with all research conducted by Health Canada, this study is impartial in nature and will adhere to strict ethical standards and undergo a peer review process to strengthen scientific rigour. Members also could not have any preconceived judgment regarding exposure to sound from wind turbines and health impacts.
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the questionnaire content, study location, timing, etc.). Confidentiality statements were required from Committee members, and are common in such research, to protect against disclosure of certain aspects of the study design that could compromise the integrity of the results (e.g. Accordingly, it is important to note that provision of advice to a particular organization does not necessarily constitute a conflict of interest.
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In an area of specialization where expertise is limited, it is widely understood that such individual experts may be called upon to provide advice to any number of bodies. Any member would however need to be without any perceived or actual conflict of interest. In the initial planning stages of this study it was clear that the Expert Committee would need to include members that had demonstrated expertise in multiple areas. The collective mandate of the Expert Committee was to design a robust study that would assess public concerns that exposure to the sound from wind turbines is having a negative impact on human health. Once all data is collected and analyzed, the analysis will be adjusted statistically to account for socio-demographic factors and meteorological conditions, should there be differences in any of these factors or conditions between groups of subjects who live close to or far from wind turbines. A much more robust approach is to assess how the prevalence of self-reported and measured endpoints change as a function of sound levels and distance from wind turbines. Such a group would also come at the expense of reducing the sample size of the exposed group. For this reason, it would not be appropriate to recruit a remote sample of subjects as a "control" group because they would not necessarily be exposed to these same conditions. The propagation of sound from wind turbines is influenced by meteorological conditions and topography. for larger wind farms they will be at further distances).Ī primary objective of this study is to apply statistical modeling to assess relationships between the sound/distance from wind turbines and both self-reported and measured endpoints. Similarly, since the size of the wind farms in this study will vary, so too will the classification of the reference groups (i.e. Because the study includes an assessment of low frequencies, which propagate further than higher frequencies, the "low frequency unexposed" group can be further away than the group that is considered to no longer be exposed to higher frequencies. Therefore, in the study, one could view the "control" group (or reference group) as the category or group which includes subjects that live in dwellings where wind turbine sound can no longer be reliably detected due to background sound levels. A proxy to this is distance to wind turbines. The wind turbine noise and health study is not an experimental design, however if viewed as an experimental design the "treatment" in this case would be exposure to sound from wind turbines. In an experimental design, a control group is a group that does not receive the treatment, but is similar to the group that does receive the treatment (treatment group) in every other aspect.