The authors say they examined several "confounding" factors but that these did not explain the correlation:
"There was a 55% to 72% increase in the odds of ADHD for a 10-fold increase in DMAP concentration, depending on the criteria used for case identification. This association was not explained by gender, age, PIR, race/ethnicity, fasting duration, or creatinine concentration."
PIR is short for poverty/income ratio, their metric of socio-economic status.
On 5/17/10 12:14 PM, "Andy" <andy274 at gmail.com> wrote:
> On Mon, May 17, 2010 at 11:39 AM, Wojtek S <wsoko52 at gmail.com> wrote:
>
>> It is quite possible that people who are more likely to be diagnosed with
>> ADHD (mostly lower socio economic strata) also are more likely to be exposed
>> to pesticides (as they cannot afford more expensive organic food,) which
>> may produce statistical correlations but not necessarily causality.
>
> Do you think it's likely they haven't taken that into account? I've
> gotten accustomed finding out that the authors and/or reviewers think
> of these things, too.