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For the quartile measure, each individual's reading and comprehension test score is recorded in the quartile of the distribution in which it falls.
The cut-offs for the quartile designation are determined using ZIP code demographic data obtained from Claritas.
c P-value based on a Wald test that the beta coefficient for the quartile contrast indicator is zero.
This significant association was present for the continuous variable, for the quartiles, and for the quartile trend test.
Importantly, only counties below the EPA NAAQS limit of 15 μg/m were used for the quartile analysis.
We compared the proportion of boys for the quartile with the highest percentage of Y-sperm to the one with the lowest percentage of Y-bearing spermatozoa.
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§Academic index quartiles are based on pre-Prop 209 enrollees and are group specific: breakpoints for the quartiles vary by minority/white status.
In column (2) we show that including dummies for the quartiles of the sector experience distribution instead of the yearly measure does not substantially alter the results.
The ranges for the quartiles are defined in Figure 4.
Threshold values for the quartiles for each hormone were created using the distribution in control individuals.
The median survival times for the quartiles are listed in Table 3.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com