PKU can be diagnosed within days of birth by a simple urine test and is treated with a diet low in phenylalanine, which may allow intellectual development to proceed.
The resulting range of PFOA levels are well above background exposure (Steenland et al. 2009), which may allow for a more informative assessment of the impact of PFOA exposure on birth outcomes.
Also, the foreskin suffers small tears during intercourse, which may allow the virus into the bloodstream.
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Vital records provided individual-level data on a number of covariates, allowing us to account for spatial confounding by these factors, and also provided residential location at the time of birth, which may be more relevant to ASD etiology than the address at diagnosis.
You also need to provide your real name, postal address, phone number, email address, and date of birth, which may weed out a few Anonymous types, as brilliant as some of them may be.
Although we have no measures of school quality, we do control for state of birth, which may be correlated with differences in school quality among states.
Similarly, mothers experiencing high child mortality tend to have more births, which may make late-birth-order children appear to have higher than average mortality.
Lastly, Herskind et al 9 included only live births, which may have impacted on their results.
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