The utility and cross-validation of a composite physical activity score in relation to cardiovascular health indicators: Coronary artery risk development in young adults

Kelley Pettee Gabriel, Adriana Pérez, David R. Jacobs, Joowon Lee, Harold W. Kohl, Barbara Sternfeld

Research output: Contribution to journalArticle

Abstract

Background: Single-method assessment of physical activity (PA) has limitations. The utility and cross-validation of a composite PA score that includes reported and accelerometer-derived PA data has not been evaluated. Methods: Participants attending the Year 20 exam were randomly assigned to the derivation (two-thirds) or validation (one-third) data set. Principal components analysis was used to create a composite score reflecting Year 20 combined reported and accelerometer PA data. Generalized linear regression models were constructed to estimate the variability explained (R2) by each PA assessment strategy (self-report only, accelerometer only, composite score, or self-report plus accelerometer) with cardiovascular health indicators. This process was repeated in the validation set to determine cross-validation. Results: At Year 20, 3549 participants (45.2 [3.6] y, 56.7% female, and 53.5% black) attended the clinic exam and 2540 agreed to wear the accelerometer. Higher R2 values were obtained when combined assessment strategies were used; however, the approach yielding the highest R2 value varied by cardiovascular health outcome. Findings from the cross-validation also supported internal study validity. Conclusions: Findings support continued refinement of methodological approaches to combine data from multiple sources to create a more robust estimate that reflects the complexities of PA behavior.

Original languageEnglish (US)
Pages (from-to)847-856
Number of pages10
JournalJournal of Physical Activity and Health
Volume15
Issue number11
DOIs
StatePublished - Nov 2018

Keywords

  • Physical activity assessmentepidemiologybiostatistics

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