Journal
ANNALS OF EPIDEMIOLOGY
Volume 19, Issue 5, Pages 316-322Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.annepidem.2009.01.001
Keywords
Bias (epidemiology); Intervention Studies; Adolescent; Exercise; Questionnaires; Social Desirability
Categories
Funding
- NHLBI [HL66845, HL66852, HL66853, HL66855, HL66856, HL66857, HL66858]
Ask authors/readers for more resources
PURPOSE: A positive outcome in self-reported behavior could be detected erroneously if an intervention caused over-reporting of the targeted behavior. Data collected from a multi-site randomized trial were examined to determine if adolescent girls who received a physical activity intervention over-reported their activity more than girls who received no intervention. METHODS: Activity was measured using accelerometers and self-reports (3-Day Physical Activity Recall, 3DPAR) in cross-sectional samples preintervention (6th grade, n = 1,464) and post-intervention (8th grade, n = 3,114). Log-transformed accelerometer minutes were regressed on 3DPAR blocks, treatment group, and their interaction, while adjusting for race, body mass index, and timing of data collection. RESULTS: Preintervention, the association between measures did not differ between groups, but postintervention 3DPAR blocks were associated with fewer log-accelerometer minutes of moderate-vigorous physical activity (MVPA) in intervention girls than in control girls (p = 0.002). The group difference was primarily in the upper 15% of the 3DPAR distribution, where control girls had > 1.7 more accelerometer minutes of MVPA than intervention girls who reported identical activity levels. Group differences in this subsample were 8.5%-16.2% of the mean activity levels; the intervention was powered to detect a difference of 10%. CONCLUSION: Self-report measures should be interpreted with caution when used to evaluate a physical activity intervention. Ann Epidemiol 2009;19:316-322. (C) 2009 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available