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After half a year of collecting responses, the "Short Poll for PANDAS/PANS Mothers" (listed at the very top of this forum) has been analyzed, and there are some interesting results! The purpose of the poll was to see if there was an association of PANDAS/PANS and the Rh negative factor. The number of Rh negatives is suspiciously high, but not to the "statistically significant" level that is typically set for this kind of analysis. It is expected that this association could be shown in a larger poll, because an association between Rh negative and autoimmunity has been well-demonstrated (see the 1st attachment for a reference). A surprise result is a statistically significant association with the A blood type among moms and PANS/PANDAS in their kids. The rate of A blood among respondents was 57% vs. 42% in the representative general population. As far as I can tell, any link between A blood and PANS/PANDAS is not previously reported or suggested on the internet. Thank-you for contributing towards this! There is (always) more that can be investigated, but we'll pick up more some time in the future. In the meantime, do read some more details, analysis and discussion about this poll in the attachments, and feel free to make suggestions for a future poll in this area. Some suggestions for additional questions are: - tallying blood types of the PANS kids - tallying blood types of both the biological parents - whether an rh- mom had the shot to prevent hemolytic anemia in an rh+ child - whether the mom had Anti-E antibodies (see MichellAnti-EMom's entry in the poll thread itself) - whether the mom had a cesarian section for her PANDAS/PANS child - how long the mom breast fed her PANDAS/PANS child WhyThisPoll.pdf AvoidingSurveyBias.pdf StatisticallySignificantResults.pdf CorrelationIsNotCausation.pdf DeeperStatsDetails.pdf