MOD10DMIN is a 3-digit-numeric variable.
000: Not in Universe
996: Extreme value
998: Unknown-not ascertained
999: Unknown-don't know
For sample adults who do moderate physical activities (MOD10FTP), MOD10DMIN is a recoded variable created by the staff at the National Center for Health Statistics that draws upon the information in MOD10DNO (Duration of moderate activity 10+ minutes: Number of units) and MOD10DTP (Duration of moderate activity 10+ minutes: Time period) and reports the duration of light or moderate leisure-time physical activities in terms of a standardized time unit, minutes. Thus, a respondent who engaged in moderate exercise for an hour and half would have a MOD10DMIN value of 90 (to represent 90 minutes).
Light or moderate leisure-time 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 Manual provides examples of light or moderate activities, although these examples were not routinely shared with respondents. These examples include leisurely walking or bicycling, slow swimming or dancing, and simple gardening.
Beginning in 2020, individuals with a duration value (ascertained through combining MOD10DNO and MOD10DTP) equivalent to 720 minutes or 12 hours or more were coded as "996 - Extreme value." Additionally, the 2020 Survey Description notes that "an instrument error in 2020 allowed for entries of more than 24 hours in duration" (85). These entries were recoded to "Extreme value."
For general discussion of how and why the NHIS collected information on adult physical activity for 1997 forward, see VIG10FNO.
MOD10DMIN is available beginning in quarter 3 of 1997. For data on the duration of respondents' light or moderate activity in the first half of 1997, see MOD20DMIN2.
The question wording for MOD10DNO and MOD10DTP, the variables used to create MOD10DMIN, changed slightly in 2004.
For all years from 1997 forward, the survey section on physical activity began with the statement, "The next questions are about physical activities (exercise, sports, physically active hobbies ...) that you may do in your leisure time." Beginning in 2004, the question about duration of light or moderate activities reiterated the point that respondents were only to report leisure-time activities. From 1997 through 2003, interviewers asked, "About how long do you do these light or moderate activities each time"; for 2004 forward, they asked, "About how long do you do these light or moderate leisure-time physical activities each time?" Thus, beginning in 2004, the question wording made explicit what had previously been implicit and had been specified in the introductory statement only.
Prior to 2020, the series of questions about moderate physical activity included that the exercise last at least 10 minutes. Beginning in 2020, people who report engaging in moderate physical exercise in MOD10FTP are in universe for MOD10DNO, regardless of whether they typically engaged in such exercise for at least 10 minutes.
Additionally, while the basic meaning of this variable is completely comparable over time, major questionnaire changes introduced in 2019 may affect comparability with earlier years. The NHIS questionnaire was substantially redesigned in 2019 to introduce a different data collection structure and new content. For more information on changes in terminology, universes, and data collection methods beginning in 2019, please see the user note.
- 1997: Sample adults age 18+ in quarters 3 and 4 who participate in moderate activities for at least 10 minutes.
- 1998-2018: Sample adults age 18+ who participate in moderate activities for at least 10 minutes.
- 2020: Sample adults age 18+ who do moderate physical activities (MOD10FTP).
- 1997-2018, 2020
- 1997-2018, 2020 : SAMPWEIGHT