Epidemiological studies of the non-specific effects of vaccines: II--methodological issues in the design and analysis of cohort studies.
نویسندگان
چکیده
We review sources of bias which can affect non-randomized cohort studies of non-specific effects of vaccines on child mortality. Using examples from the literature on non-specific effects, we describe different sources of selection and information bias, and, where possible, outline analysis strategies to mitigate or eliminate such biases.
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ورودعنوان ژورنال:
- Tropical medicine & international health : TM & IH
دوره 14 9 شماره
صفحات -
تاریخ انتشار 2009