Abstract
The purpose of this study was to assess raters' agreement and objectivity in using the Compendium of Physical Activities to code physical activity diaries. This study assessed agreement in assigning metabolic equivalent (MET) codes and values and raters' objectivity in estimating energy expenditure were assessed. A secondary purpose of this study was to compare agreement and objectivity in coding English and Spanish physical activity diaries. In total, 48 diaries were coded by 4 trained raters. Generalizability theory was used to determine raters' objectivity. Agreement in assigning MET codes and MET values to individual activities ranged from 44% to 92%. The generalizabilty analyses indicated the raters' objectivity was high for the English and Spanish diaries (>.80). Objectivity in coding increased with 2 raters but remained adequate with just 1 rater. Therefore, using detailed diaries and trained raters may preclude the need for double coding physical activity diaries. Furthermore, eliminating codes from the Compendium of Physical Activities that are redundant or have overlapping descriptions may reduce disagreement in MET codes and values between raters.
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