Create.pam* Programs

The SAS programs create.pam_perminute.sas, create.pam_perday.sas, and create.pam_perperson.sas edit the NHANES 2003-2004 PAM data and create datasets that can be used for analyses. The raw data are available for download from the NCHS. Modify the programs for your local environment.

Users can modify these programs to examine other issues, such as alternate definitions of valid data, monitor wear periods, or activity bouts. Intermediate SAS programming skills are recommended for those who wish to modify the definitions.

We also have included .log and .lst files resulting from our analysis of the NHANES data for the files named create.* These files are intended to help users confirm they are getting sensible results.

create.pam_perminute.sas

This program edits invalid and unreliable intensity values in the PAM data.

Input:

• Physical Activity Monitor data paxraw_c.sas7bdat
• PAM_formats.sas, a file with SAS code for formats

Output:

• pam_perminute (local)

.log and .lst files

• create.pam_perminute.log
• create.pam_perminute.lst

create.pam_perday.sas

This program summarizes valid PAM data into a dataset with one record per person per day. The summary record contains derived variables on duration of non-wear periods as well as activity bouts with moderate, vigorous, and moderate or vigorous intensity. The output dataset can be used for analysis at the day level, and it is an intermediate step for creating the pam_perperson dataset.

Input:

• pam_perminute (local - this is the output from create.pam_perminute.sas)

Output:

• pam_perday (local)

.log and .lst files

• create.pam_perday.log
• create.pam_perday.lst

create.pam_perperson.sas

This program summarizes valid PAM data into a dataset with one record per person and adds demographic variables. The output dataset can be used for analysis at the person level.

Input:

• pam_perday (local - this is the output from create.pam_perday.sas)
• Demographic data DEMO_C.XPT
• PAM_formats.sas, a file with SAS code for formats

Output:

• pam_perperson (local)

.log and .lst files

• create.pam_perperson.log
• create.pam_perperson.lst