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YRBSS
Frequently Asked Questions
Analyzing YRBS Data Files
What software should I use to analyze YRBS data?
See Software for Analysis of YRBS Data [pdf 285K] for a review of
software packages suitable for analyzing YRBS data and guidance on how to
use them.
How are the national, state, and local YRBS data different?
National, state, territory, and local YRBS data
come from separate scientific samples of schools and
students. National YRBS data are not the aggregate
of the state YRBS data. State, territory, and local
YRBS data are not subsets of the National YRBS data
set. National, state, territory, and local YRBS’s
all follow the same survey methodology and use the
same core questionnaire.
Does the National YRBS include schools and students
from every state?
No. The national YRBS sample is designed to be
representative of students in grades 9-12 in the
United States overall and therefore does not
necessarily include students from every state.
Where can I get the National YRBS data files?
See 2007 National Data
Files and Documentation and
1991-2005
National Data Files and Documentation.
Why are results from every state not available?
Results are not available from every state
because some states do not participate in the YRBS
(in 2007, California, Louisiana, Minnesota,
Pennsylvania, Virginia, and Washington did not
participate) and some states that do participate did
not achieve a high enough overall response rate to
receive weighted results (in 2007, Alabama, New
Jersey, Nebraska, Colorado, and Oregon did
participate but did not get weighted data);
therefore, their results are not posted on this Web
site. The 2007 YRBS
Participation Map and the YRBS
History of
Participation & Data Quality tables provide more
details on which states have conducted a YRBS and
whether they obtained weighted data.
Are county level YRBS results available?
In 2007, CDC funded 22 large urban school
districts to conduct a YRBS. Six of them (Miami-Dade
County, FL; Broward County, FL; DeKalb County, GA;
Orange County, FL; Hillsborough County, FL; and
Charlotte-Mecklenburg County, NC) are county-based
school districts. The other funded school districts
are identified on the YRBS
Participation Map
and the YRBS History of
Participation & Data Quality tables. County
level identifiers are not available on the National
YRBS data file or on state data files.
How can I get the data file for a specific state or
district?
State and local data files and documentation are
owned and controlled by the jurisdictions that
conducted the survey. Many states and districts have
given CDC permission to distribute their data files
upon request. Other states and districts manage the
distribution of their data files themselves. For
information on acquiring data files from specific
states or districts, please contact us using
this form.
How do I use the SAS format library?
The SAS format library contains the formats used to make SAS
output more readable. Formats are linked to the data so that
results are displayed as words (“Male” or “Female”, for
instance) instead of numbers (1 or 2). The SAS YRBS data file is
designed to use its companion format library. You should
download both the data file and the format library if you want
to use SAS to analyze YRBS data.
The following example SAS program shows how to use the format
library. It assumes that both the data file and the format
library have been downloaded to “c:\data”. Note that the program
contains two libname statements. The
first libname statement indicates
where the data file is located; the second
libname statement indicates where the format library is
located.
libname mydata 'c:\data'; /*
tells SAS
where the data are */
libname library 'c:\data'; /* tells SAS where the formats are */
proc freq data=mydata.yrbs2005;
tables q2;
run; |
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Using the format library is recommended but technically is
optional. If you do not want to use the format library, include
the following statement at the start of your SAS program:
options nofmterr; /*
tells SAS to not look for
formats */ |
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Please note that each year of YRBS data has its own format
library. Format libraries are not the same across years of data.
For further information on using format libraries, please
consult your SAS documentation.
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Uses of Youth Risk Behavior Surveillance System
(YRBSS) Results
How are the YRBSS results used?
State, territorial, and local agencies and nongovernmental organizations use YRBS
data to set and track progress toward meeting school health and health
promotion program goals, support modification of school health curricula
or other programs, support new legislation and policies that promote
health, and seek funding and other support for new initiatives.
CDC and other federal agencies routinely use YRBS data to assess
trends in priority health risk behaviors among high school students,
monitor progress toward achieving 15
Healthy
People 2010 objectives and
3
leading health indicators, and evaluate the contribution of broad
prevention efforts in schools and other settings toward helping the
nation reduce health risk behaviors among youth.
Can student behavior changes over time be tracked using the YRBSS?
Yes. The YRBSS tracks aggregate changes in student behavior over
time. See the YRBS Trend Fact Sheets for more information.
Does the YRBSS track specific students over time?
No. Each year a new sample of schools and students is drawn. Students
who participated cannot be tracked because no identifying information is
collected.
Is it appropriate to report prevalence estimates for any of the racial/ethnic subgroups (e.g., American Indian/Alaskan Native students) asked about on the National YRBS questionnaire?
Although prevalence estimates generated for students in each racial/ethnic subgroup are representative of these students nationally, caution should be used when analyzing and interpreting these data. Because of the small numbers of students in some racial/ethnic subgroups who participate in any single National YRBS, the estimates will lack precision. Precision can be improved by combining multiple years of National YRBS data.
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Youth Risk Behavior Survey (YRBS) Questionnaire Content
What is the suggested citation for the YRBS questionnaire in a
publication?
The YRBS questionnaire should be cited as follows:
Centers for Disease Control and Prevention. 2007 Youth Risk Behavior
Survey. Available at: www.cdc.gov/yrbss. Accessed on [date].
What behaviors are assessed by the YRBSS?
The YRBSS assesses six categories of priority health risk behaviors—behaviors that contribute to unintentional injuries and violence;
tobacco use; alcohol and other drug use; sexual behaviors that
contribute to unintended pregnancy and STDs, including HIV infection;
unhealthy dietary behaviors; and physical inactivity—plus overweight
and asthma.
Will asking questions about certain topics actually encourage certain
behaviors?
There is no evidence that simply asking students about health risk
behaviors will encourage them to try that behavior.
Can state and local agencies that conduct a YRBS modify the core
questionnaire?
Yes. State and local agencies that conduct a YRBS can add or delete
questions to meet their policy or programmatic needs. Specific guidance
on the parameters that must be followed during questionnaire
modification is provided to those agencies funded by CDC to conduct a
YRBS.
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Administration
How long does it take to complete a YRBS questionnaire? Does the survey
include a physical test?
One class period is needed. It takes approximately 10 minutes for the
survey administrator to distribute survey materials and read directions
to the students. It then takes approximately 35 minutes for students to
record their responses. No physical test or exam is involved.
How should the YRBS be conducted?
YRBS procedures are designed to protect student privacy by allowing
for anonymous participation. Participation in the YRBS is voluntary.
Local parental permission procedures are followed. Students
complete the self-administered questionnaire during one class period and
record their responses on a computer-scannable questionnaire booklet or
separate answer sheet.
Is parental permission obtained? What type?
Yes. Local parental permission procedures are followed prior to
administration of a YRBS.
Are students required to participate in the YRBS?
No. The YRBS is always a voluntary activity for states, school
districts, schools, and students.
Can my district volunteer to be in a YRBS?
Not in a YRBS supported by CDC. Any district or
school may choose to conduct its own YRBS. See A Guide to Conducting
Your Own Youth Risk Behavior Survey [pdf 108K]
for information useful to communities and groups that plan to conduct
their own YRBS survey.
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Validity & Reliability
Do students tell the truth on the YRBS questionnaire?
Research indicates data of this nature may be gathered as credibly
from adolescents as from adults. Internal reliability checks help identify the small percentage of students who falsify their answers. To
obtain truthful answers, students must perceive the survey as important
and know procedures have been developed to protect their privacy and
allow for anonymous participation.
What kinds of validation or reliability studies have been done on the
YRBS questionnaire?
The
Methodology of the Youth Risk Behavior Surveillance System
[pdf
270K]
contains a description of most of the methodological studies conducted to date on the YRBS questionnaire or YRBS data
collection procedures. In addition, the list of YRBS
reports and
publications contains the actual journal articles describing the results
of these studies.
These methodological studies include test-retest reliability studies on the
1991 and 1999 versions of the questionnaire; a study assessing the
validity of self-reported height and weight; a study assessing the
effect of changing the race/ethnicity question; a study examining how
varying honesty appeals, question wording, and data-editing protocols
affect prevalence estimates; and a study examining how varying the mode
and setting of survey administration affects prevalence estimates.
Methodology
What does it mean for data to be “weighted?”
Weighting is a mathematical procedure that makes data representative
of the population from which it was drawn. In the YRBSS, only surveys
with a scientifically drawn sample, appropriate documentation, and an
overall response rate of at least 60% are weighted.
How are YRBS data weighted?
YRBS data are weighted to adjust for school and student nonresponse
and to make the data representative of the population of students from
which the sample was drawn. Generally, these adjustments are made by
applying a weight based on student sex, grade, and race/ethnicity.
Who does the National YRBS data represent?
National YRBS data are representative of all public and private
school students in grades 9-12 in the 50 states and the District of
Columbia. National YRBS data are not the aggregate of the state YRBS
data; the National YRBS uses a separate scientific sample of schools and
students.
Who does the state and local YRBS data represent?
State, territory and local YRBS data that are weighted are representative of all
public school students in grades 9-12 in the respective jurisdiction.
State, territory, and local YRBS data that are not weighted are representative only
of the students who completed the survey in the respective jurisdiction.
How are schools and students selected?
For the national, state, territory, and local YRBS samples, schools are selected
with probability proportional to the size of student enrollment in
grades 9-12 and then required classes of students (e.g., English classes)
are randomly selected to participate. Within selected classes, all
students are eligible to participate. See the
Methodology of the Youth Risk Behavior Surveillance System
[pdf
270K] for a more detailed description of
sampling procedures.
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Conducting Your Own YRBS
How do I conduct a YRBS in my area/district/school?
See A Guide to Conducting Your Own Youth Risk Behavior Survey [pdf 108K]
for information useful to communities and groups that plan to conduct
their own YRBS survey.
Do I need permission to use the YRBS questionnaire for my
study/area/district/school? Is there a cost?
The YRBS questionnaire is in the public domain and no permission is
required to use it. You may download the questionnaire no charge. See
Questionnaires and Item Rationale for the most recent YRBS questionnaires.
If I conduct a YRBS, can CDC help me scan, process, or tabulate my data?
CDC provides data processing assistance only to states, territories, and large urban
school districts that it funds directly to conduct a YRBS. However,
information on how the data are processed can be found on the YRBS
National Data
Files and Documentation page and in the
Methodology of the Youth Risk Behavior Surveillance System
[pdf
270K].
Is funding available for conducting a YRBS?
CDC has funding available for all 50 state education agencies and only a
small number of territories, tribal governments, and large urban school districts during each five year funding
cycle.
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