2Cents:D. The occurrence of autism is almost the same in similar groups, the significant size of the study would make it extremely unlikely that one group had factors that would even it out with any other group, unless you conclude that the MMR plays no factor with regards to autism.
The FACT that children showing signs of Autism are more likely NOT to get MMR Skews the results!
You Refuse to answer the question – WHY does EVERY clinical trial use RANDOMIZATION?
because then you would admit that the study is INVALID because who got the MMR was not randomized – which means that children showing signs of Autism will be concentrated in the NO MMR Group!