|Posted on November 5, 2017 at 10:55 AM|
The problems with the majority of studies aiming to address the issue of causality include the failure to define appropriate case groups and the failure to include potential cases as controls. For cohort studies, poorly defined exposure events, with little consideration of the timing of exposures or the cumulative effect of several exposures over time, have contributed to design flaws. Other problems include poor understanding of the actual hypotheses and retrospective analysis of data gathered in studies not originally designed to address the issue.
Carol Stott (PhD, MSc [Epidemiology], CSci, CPsychol), and Andrew Wakefield (MB, BS, FRCS, FRCPath)
Categories: Vax Facts