The ERS Eating and Health Module, a supplement to the American Time
Use Survey (ATUS), included questions on height and weight so that
respondents' Body Mass Index (BMI-a measure of body fat based on
height and weight) could be calculated and analyzed with ATUS
time-use data in obesity research. Some respondents did not report
height and/or weight, and BMIs could not be calculated for them.
Analyses focusing on correlations between BMIs and time use could
be biased if respondents who did not report height and/or weight
differ significantly in other observable characteristics from the
rest of the survey respondents. However, findings reveal that any
nonresponse bias associated with the height and weight data appears
to be small and would not affect future analyses of BMIs and
time-use pattern correlations.
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