Identifying and Quantifying the Unintended Variability in Common Systematic Observation Instruments to Measure Youth Physical Activity.

Abstract:

BACKGROUND:Direct observation protocols may introduce variability in physical activity estimates. METHODS:Thirty-five physical education lessons were video recorded and coded using the System for Observing Fitness Instruction Time (SOFIT). A multistep process examined variability in moderate to vigorous physical activity (MVPA%; walking + vigorous/total scans). Initially, per-SOFIT protocol MVPA% (MVPA%SOFIT) estimates were produced for each lesson. Second, true MVPA% (mean MVPA% of all students using all observations, MVPA%true) estimates were calculated. Third, MVPA% (MVPA%perm) was calculated based on all permutations of students and observation order. Fourth, physical education lessons were divided into 2 groups with 5 lessons from each group randomly selected 10,000 times. Group MVPA%perm differences between the 10 selected lessons were compared with the MVPA%true difference between group 1 and group 2. RESULTS:Across all lessons, 10,212,600 permutations were possible (average 291,789 combinations per lesson; range = 73,440-570,024). Across lessons, the average absolute difference between MVPA%true and MVPA%SOFIT estimates was ±4.8% (range = 0.1%-17.5%). Permutations, based on students selected and observation order, indicated that the mean range of MVPA%perm estimates was 41.6% within a lesson (range = 29.8%-55.9%). Differences in MVPA% estimates between the randomly selected groups of lessons varied by 32.0%. CONCLUSION:MVPA% estimates from focal child observation should be interpreted with caution.

journal_name

J Phys Act Health

authors

Weaver RG,Beighle A,Erwin H,Whitfield M,Beets MW,Hardin JW

doi

10.1123/jpah.2017-0375

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

651-660

issue

9

eissn

1543-3080

issn

1543-5474

journal_volume

15

pub_type

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