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Correlates of agreement between accelerometry and self-reported physical activity

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Abstract
Purpose: Understanding factors that influence accurate assessment of physical activity (PA) and sedentary behavior (SB) is important to measurement development, epidemiologic studies, and interventions. This study examined agreement between self-reported (International Physical Activity QuestionnaireLong Form [IPAQ-LF]) and accelerometry-based estimates of PA and SB across six countries and identified correlates of between-method agreement. Methods: Self-report and objective (accelerometry-based) PA and SB data were collected in 2002-2011 from 3865 adult participants in eight cities from six countries (Belgium, Czech Republic, Denmark, Spain, United Kingdom, and United States). Between-method relative agreement (correlation) and absolute disagreement (mean difference between conceptually and intensity-matched IPAQ-LF and accelerometry-based PA and SB variables) were estimated. Also, sociodemographic characteristics and PA patterns were examined as correlates of between-method agreement. Results: Observed relative agreement (relationships of IPAQ-LF with accelerometry-based PA and SB variables) was small to moderate (r = 0.05-0.37) and was moderated by sociodemographic (age, sex, weight status, and education) and behavioral (PA-type) factors. The absolute disagreement was large, with participants self-reporting higher PA intensity and total time in moderate-to-vigorous-intensity PA than accelerometry. Also, self-reported sitting time was lower than accelerometry-based sedentary behavior. After adjusting for sociodemographic and behavioral factors, the absolute disagreement between pairs of IPAQ-LF and accelerometry-based PA variables remained significantly different across cities/countries. Conclusions: Present findings suggest systematic cultural and/or linguistic and sociodemographic differences in absolute agreement between the IPAQ-LF and the accelerometry-based PA and SB variables. These results have implications for the interpretation of international PA and SB data and correlate/determinant studies. They call for further efforts to improve such measures.
Keywords
INTERNATIONAL PHYSICAL ACTIVITY QUESTIONNAIRE, LONG FORM, INTERNATIONAL, SOCIODEMOGRAPHIC FACTORS, MEASUREMENT, EXERCISE, SEDENTARY TIME, ACTIVITY QUESTIONNAIRE-SHORT, IPEN ADULT, SHORT-FORM, VALIDITY, IPAQ, RELIABILITY, NEIGHBORHOOD, VALIDATION, COUNTRIES, ENVIRONMENTS

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Chicago
Cerin, Ester, Kelli L Cain, Adewale L Oyeyemi, Neville Owen, Terry L Conway, Tom Cochrane, Delfien Van Dyck, et al. 2016. “Correlates of Agreement Between Accelerometry and Self-reported Physical Activity.” Medicine and Science in Sports and Exercise 48 (6): 1075–1084.
APA
Cerin, E., Cain, K. L., Oyeyemi, A. L., Owen, N., Conway, T. L., Cochrane, T., Van Dyck, D., et al. (2016). Correlates of agreement between accelerometry and self-reported physical activity. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 48(6), 1075–1084.
Vancouver
1.
Cerin E, Cain KL, Oyeyemi AL, Owen N, Conway TL, Cochrane T, et al. Correlates of agreement between accelerometry and self-reported physical activity. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE. 2016;48(6):1075–84.
MLA
Cerin, Ester, Kelli L Cain, Adewale L Oyeyemi, et al. “Correlates of Agreement Between Accelerometry and Self-reported Physical Activity.” MEDICINE AND SCIENCE IN SPORTS AND EXERCISE 48.6 (2016): 1075–1084. Print.
@article{8502955,
  abstract     = {Purpose: Understanding factors that influence accurate assessment of physical activity (PA) and sedentary behavior (SB) is important to measurement development, epidemiologic studies, and interventions. This study examined agreement between self-reported (International Physical Activity QuestionnaireLong Form [IPAQ-LF]) and accelerometry-based estimates of PA and SB across six countries and identified correlates of between-method agreement. 
Methods: Self-report and objective (accelerometry-based) PA and SB data were collected in 2002-2011 from 3865 adult participants in eight cities from six countries (Belgium, Czech Republic, Denmark, Spain, United Kingdom, and United States). Between-method relative agreement (correlation) and absolute disagreement (mean difference between conceptually and intensity-matched IPAQ-LF and accelerometry-based PA and SB variables) were estimated. Also, sociodemographic characteristics and PA patterns were examined as correlates of between-method agreement. 
Results: Observed relative agreement (relationships of IPAQ-LF with accelerometry-based PA and SB variables) was small to moderate (r = 0.05-0.37) and was moderated by sociodemographic (age, sex, weight status, and education) and behavioral (PA-type) factors. The absolute disagreement was large, with participants self-reporting higher PA intensity and total time in moderate-to-vigorous-intensity PA than accelerometry. Also, self-reported sitting time was lower than accelerometry-based sedentary behavior. After adjusting for sociodemographic and behavioral factors, the absolute disagreement between pairs of IPAQ-LF and accelerometry-based PA variables remained significantly different across cities/countries. 
Conclusions: Present findings suggest systematic cultural and/or linguistic and sociodemographic differences in absolute agreement between the IPAQ-LF and the accelerometry-based PA and SB variables. These results have implications for the interpretation of international PA and SB data and correlate/determinant studies. They call for further efforts to improve such measures.},
  author       = {Cerin, Ester and Cain, Kelli L and Oyeyemi, Adewale L and Owen, Neville and Conway, Terry L and Cochrane, Tom and Van Dyck, Delfien and Schipperijn, Jasper and Mit{\'a}\v{s}, Josef and Toftager, Mette and Aguinaga-Ontoso, Ines and Sallis, James F},
  issn         = {0195-9131},
  journal      = {MEDICINE AND SCIENCE IN SPORTS AND EXERCISE},
  keyword      = {INTERNATIONAL PHYSICAL ACTIVITY QUESTIONNAIRE,LONG FORM,INTERNATIONAL,SOCIODEMOGRAPHIC FACTORS,MEASUREMENT,EXERCISE,SEDENTARY TIME,ACTIVITY QUESTIONNAIRE-SHORT,IPEN ADULT,SHORT-FORM,VALIDITY,IPAQ,RELIABILITY,NEIGHBORHOOD,VALIDATION,COUNTRIES,ENVIRONMENTS},
  language     = {eng},
  number       = {6},
  pages        = {1075--1084},
  title        = {Correlates of agreement between accelerometry and self-reported physical activity},
  url          = {http://dx.doi.org/10.1249/mss.0000000000000870},
  volume       = {48},
  year         = {2016},
}

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