MOD20DMIN2 is a 3-digit-numeric variable.

000: Not in Universe
997: Unknown-refused
998: Unknown-not ascertained
999: Unknown-don't know

Description

MOD20DMIN2 is a recoded variable created by the staff at the National Center for Health Statistics that draws upon the information in MOD20DNO2 and MOD20DTP2 and reports the duration of light or moderate leisure-time physical activities (for at least 20 minutes) in terms of a standardized time unit, minutes. Thus, a respondent who engaged in moderate exercise for an hour and half would have a MOD20DMIN2 value of 90 (to represent 90 minutes).

Light or moderate activities are described in the survey questionnaire 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.

Comparability

Due to an error in the wording of the survey question, MOD20DMIN2 is only available for quarters 1 and 2 of 1997. At that time respondents were asked to report how long 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.

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

Universe

Availability

• 1997

Weights

• 1997 : SAMPWEIGHT