PolicyLink and PERE
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An Equity Profile of Orange County
Health data and analysis
Data and methods
Health data in this study were taken from the
California Health Interview Survey (CHIS),
housed in the UCLA Center for Health Policy
Research. The AskCHIS is tool created from
randomized telephone surveys of households
conducted by SQL Server Reporting Services
(SSRS).
The results of this survey are self-reported
and the population includes one randomly
selected adult in the household and
children/adolescents if they were present.
The most detailed level of geography
associated with individuals in the AskCHIS
data is the 58 counties in California.
While the data allow for the tabulation of
personal health characteristics, it is important
to keep in mind that because such tabulations
are based on samples, they are subject to a
margin of error and should be regarded as
estimates—particularly in smaller regions and
for smaller demographic subgroups.
To increase statistical reliability, we combined
five years of survey data, for the years 2013
through 2017. As an additional effort to avoid
reporting potentially misleading estimates,
we do not report any estimates that are
statistically unstable, meaning that the
estimate has a coefficient of variation greater
than 30 percent which is the rule for
statistical instability indicated in the
documentation for the 2017 CHIS
documentation (see:
http://healthpolicy.ucla.edu/chis/faq/Pages/d
efault.aspx#e4). Even with this sample size
restriction, regional estimates for smaller
demographic subgroups should be regarded
with particular care.
For more information and access to the
AskCHIS database, please visit:
http://healthpolicy.ucla.edu/chis/Pages/defau
lt.aspx.
