On a three - month moving average basis, three of the four
census regions also rose to levels last seen five to seven years ago.
A very large school district in the
Western census region using Exact Path provided individual student demographics.
The biggest projected increases in person days is the Texas, Oklahoma, Louisiana,
Arkansas census region where by mid-century heat exposure will increase by 2.7 billion person days.
Comparing the age, sex and
census region of the participants, and income groupings of their parents with the US 2000 Census data confirmed that the participants were a representative sample.
The distributions of demographics and
census region in the unweighted sample were almost identical to 2000 US Census estimates, confirming representativeness.
Random sampling procedures were employed to ensure the respondents accurately reflect the nation s 42.7 million 8 - 17 year olds in terms of age, race / ethnicity, gender and
census region.
This association did not differ significantly by race / ethnicity or
census region.