2018 BRFSS Survey Data and Documentation

The 2018 BRFSS data continue to reflect the changes initially made in 2011 for weighting methodology (raking) and adding cell-phone-only respondents. The aggregate BRFSS combined landline and cell phone data set is built from the landline and cell phone data submitted for 2018 and includes data for 50 states, the District of Columbia, Guam, and Puerto Rico.

 

2018 Survey Data Information

2018 BRFSS Overview CDC pdf icon[PDF – 298 KB]
Provides information on the background, design, data collection and processing, and the statistical and analytical issues for the combined landline and cell phone data set.

2018 BRFSS Codebook CDC pdf icon[PDF – 10 MB]
Codebook for the file showing variable name, location, and frequency of values for all reporting areas combined for the combined landline and cell phone data set.

Calculated Variables in Data Files CDC pdf icon[PDF – 1.91 MB]

2018 Summary Data Quality Report with Response Rates CDC pdf icon[PDF – 2.19 MB]

Complex Sampling Weights and Preparing Module Data for Analysis CDC pdf icon[PDF – 564 KB]
An explanation of the need to use complex sampling weights and instructions for preparing a module data set for analysis.

BRFSS Combined Landline and Cell Phone Weighted Response Rates by State, 2018 CDCpdf icon

Comparability of Data CDC pdf icon[PDF – 178 KB]
Comparability of data across reporting areas for the combined landline and cell phone data set. The BRFSS 2018 data is not directly comparable to years of BRFSS data before 2011 because of the changes in weighting methodology and the addition of the cell phone sampling frame.

BRFSS Modules Used by State
BRFSS Modules Used by Category

Arranged by state or by category for the combined landline and cell phone data set.

Summary Matrix of Calculated Variables (CV) in the 2018 Data File

2018 Weighting Formula CDC pdf icon[PDF – 473 KB]

Data Files

There are 437,436 records for 2018. More information on participation is available in the states conducting surveillance, by year table. The data files are provided in ASCII and SAS Transport formats.

2018 BRFSS Data (ASCII) ZIP [ZIP – 66.2 MB]
August, 2019
This file for the combined landline and cell phone data set is in ASCII format. It has a fixed record length of 2033 positions.

2018 BRFSS Data (SAS Transport Format) ZIP [ZIP – 101 MB]
August, 2019
This file for the combined landline and cell phone data set was exported from SAS V9.3 in the XPT transport format. This file contains 275 variables. This format can be imported into SPSS or STATA. Please note: some of the variable labels get truncated in the process of converting to the XPT format so they may be slightly different from what is on the SASOUT18.SAS program.

Variable Layout
Format information on variable name by column position.

The Combined Landline and Cellular Telephone Survey Multiple Questionnaire Version Data–includes Optional Modules
The combined landline and cellular telephone multiple version questionnaire data sets contain the data from the states which conducted more than one version of their landline and cellular telephone survey questionnaires and used optional modules in 2018.

 

SAS Resources

The following files are included for use with SAS software developed by SAS Institute, Inc. The SAS files are programs that can be read using any text editor. Save SAS files as plain text files.

Format18.sas CDC sas icon[SAS – 685 KB]
SAS for Windows program used to generate the 2018 format library.

Formats18 [SAS7BCAT Direct Download – 493 KB] Format library used with the 2018 BRFSS SAS Data File in 32 bit SAS.

Formats18 [SAS7BCAT Direct Download – 493 KB] Format library used with the 2018 BRFSS SAS Data File in 64 bit SAS.

SASOUT18_LLCP.SAS [SAS – 34 KB]
SAS for Windows program to convert the ASCII file into a SAS dataset.

TRANSPRT.SAS [SAS – 3 KB]
SAS for Windows program to convert the XPT (SAS Transport) file into a SAS dataset.

Formas18.sas CDC sas icon[SAS – 64 KB]
SAS for Windows format assignment statements.