In this study, we report findings from a comparability assessment of epoetin alfa before and after a proposed manufacturing process change.
For example, enhanced translation and verification methodologies are needed to ensure the comparability of assessment instruments across the range of languages and cultures participating in international surveys.
The methodological issues related to the accuracy and comparability of assessment based on attributable fraction include the following questions: Is the estimate of exposure used for assessing the effect valid?
For the retrospective studies, the quality assessment was based on participant selection, comparability and exposure assessment; For the prospective studies, the quality assessment was based on participant selection, comparability and outcome.
The scale evaluates selection of the cohort, exposure assessment, comparability of exposed and non-exposed cohorts, assessment of outcome, and adequacy of follow-up.
For comparability, age-standardized assessments of the proportion seropositive were calculated, weighted by 5-year age brackets to a reference population (Australian population on June 1, 2009) (18 ).
Studies have demonstrated that some assessment approaches may not be reflecting this change with trainers drawing on their own assessment strategies, reducing the comparability and accuracy of assessments.
The following items were assessed in each study: exposed cohort, ascertainment of exposure, outcome of interest, comparability of cohorts, assessment of outcome, and adequacy of follow-up.
In limited situations, where supported by a risk assessment, comparability protocols may be specified in filed documentation.
40 Using the Newcastle-Ottawa Scale, we will award each study a maximum of nine points for items related to selection, comparability and outcome assessment bias.
