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Frequency of moderate activity 20+ minutes: Times per week


MOD20FWK2 is a 2-digit-numeric variable.

00: Not in Universe
94: Less than once per week
95: Never
96: Unable to do this activity
97: Unknown-refused
98: Unknown-not ascertained
99: Unknown-don't know


MOD20FWK2 is a recoded variable created by the staff at the National Center for Health Statistics that draws upon the information in MOD20FTP2 and MOD20FNO2 and reports the frequency of light or moderate leisure-time physical activities in terms of a single time unit, times per week.

Light or moderate activities are described in the survey question itself as activities that "cause only light sweating or a slight to moderate increase in breathing or heart rate." The Field Representative's Manuals for 1997 forward provide examples of light or moderate leisure-time physical activities, although these examples were not routinely shared with respondents. These examples include leisurely walking or bicycling, slow swimming or dancing, and simple gardening.


Due to an error in the wording of the survey question, MOD20WK2 is only available for quarters 1 and 2 of 1997. At that time respondents were asked to report how frequently they engaged in physical activities lasting a minimum of 20 minutes. This mistake was corrected beginning in quarter 3 of 1997, when the minimum duration of physical activity was lowered to 10 minutes.

To allow analysis of light or moderate leisure-time physical activity across all quarters of 1997, the National Center for Health Statistics created "transitional" variables for 1997 only, covering respondents who did light or moderate exercise for at least 20 minutes.


See MOD20FNO2 for a list and discussion of these transitional variables on light or moderate physical activity for at least 20 minutes. which are available for 1997 only.

Researchers who wish to analyze data from multiple years on adults' light and moderate leisure-time physical activity should restrict their data from 1997 to quarters 3 and 4 and use variables beginning with "MOD10."


See VIG10FNO for an overview of the variables relating to adults' leisure-time physical activity for at least 10 minutes for the third quarter of 1997 forward.


  • 1997: Sample adults age 18+ in quarters 1 and 2.


  • 1997