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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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MLA
Cerin, Ester 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.
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.
Chicago author-date
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.
Chicago author-date (all authors)
Cerin, Ester, Kelli L Cain, Adewale L Oyeyemi, Neville Owen, Terry L Conway, Tom Cochrane, Delfien Van Dyck, Jasper Schipperijn, Josef Mitáš, Mette Toftager, Ines Aguinaga-Ontoso, and James F Sallis. 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.
IEEE
[1]
E. Cerin et al., “Correlates of agreement between accelerometry and self-reported physical activity,” MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, vol. 48, no. 6, pp. 1075–1084, 2016.
@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 Mitáš, Josef and Toftager, Mette and Aguinaga-Ontoso, Ines and Sallis, James F},
  issn         = {0195-9131},
  journal      = {MEDICINE AND SCIENCE IN SPORTS AND EXERCISE},
  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},
  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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