Comments by "Jay Dee Johnson" (@jaydeejohnson7) on "The New York Times"
channel.
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However, the goal of the pilot study was rather to obtain a convenience sample of unvaccinated children of sufficient size to test for significant differences in outcomes between the groups.
In other words, a pilot study using convenience sampling of home school children and parental surveys.
Study limitations include the relatively small number of preterm children and children with NDD. To preserve anonymity, the reported health outcomes could not be validated by clinical records. However, self-reports are accepted as a valid proxy for official records when the latter are unavailable [63]. A further potential limitation is that morbidity may have been under-estimated in unvaccinated children, as they were less likely than the vaccinated to see a physician for a routine checkup in the past year (57.6% vs. 37.2%, p <0.001; OR 2.3, 95% CI: 1.7, 3.2). This could be due to the fact that such visits usually involve vaccinations, which non-vaccinating families would be expected to refuse. However, unvaccinated children were more likely than the vaccinated to be diagnosed with chickenpox and pertussis, which would have involved one or more visits to the pediatrician. This suggests that observed differences in health outcomes were not due to under-ascertainment of disease.
That's a substantial limitation
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