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Melanna F. Cox, Greg J. Petrucci Jr., Robert T. Marcotte, Brittany R. Masteller, John Staudenmayer, Patty S. Freedson and John R. Sirard

( 1 ), 141 – 151 . doi:10.1901/jaba.1991.24-141 10.1901/jaba.1991.24-141 Mckenzie , T.L. ( 2002 ). The use of direct observation to assess physical activity . In: Welk , G , ed. Physical activity assessments for health-related research (pp.  179 – 195 ). Champaign, IL : Human Kinetics

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Joseph M. Stock, Ryan T. Pohlig, Matthew J. Botieri, David G. Edwards and Gregory M. Dominick

wrist-worn activity trackers . Annals of Internal Medicine, 167 ( 8 ), 607 – 608 . PubMed ID: 29049770 doi:10.7326/L17-0380 10.7326/L17-0380 Dominick , G.M. , Winfree , K.N. , Pohlig , R.T. , & Papas , M.A. ( 2016 ). Physical activity assessment between consumer- and research

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Ignacio Perez-Pozuelo, Thomas White, Kate Westgate, Katrien Wijndaele, Nicholas J. Wareham and Soren Brage

. , & Ekelund , U. ( 2005 ). Integration of physiological and accelerometer data to improve physical activity assessment . Medicine & Science in Sports & Exercise, 37 ( Suppl. 11 ), S563 – 71 . 10.1249/01.mss.0000185650.68232.3f Thompson , D. , Batterham , A.M. , Bock , S. , Robson , C

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Samantha F. Ehrlich, Amanda J. Casteel, Scott E. Crouter, Paul R. Hibbing, Monique M. Hedderson, Susan D. Brown, Maren Galarce, Dawn P. Coe, David R. Bassett and Assiamira Ferrara

Permanente Northern California, 2014–2015 n (%) Age (years)  18–24 6 (5.6%)  25–29 23 (21.3%)  30–34 45 (41.7%)  35+ 34 (31.5%) Gestational age at the physical activity assessment (weeks)  8–10 28 (25.9%)  11–12 60 (55.6%)  13–15 20 (18.5%) Pre-pregnancy BMI (kg/m 2 )  Overweight (≥25.2) 68 (63.0%)  Obese

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Danilo R. Silva, Cláudia S. Minderico, Pedro B. Júdice, André O. Werneck, David Ohara, Edilson S. Cyrino and Luís B. Sardinha

.1186/s12966-018-0652-x 10.1186/s12966-018-0652-x 29482617 7. Ainsworth B , Cahalin L , Buman M , Ross R . The current state of physical activity assessment tools . Prog Cardiovasc Dis . 2015 ; 57 ( 4 ): 387 – 395 . PubMed ID: 25446555 doi:10.1016/j.pcad.2014.10.005 10.1016/j.pcad.2014

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Areeya Jirathananuwat and Krit Pongpirul

]. College Station, TX : StataCorp LP ; 2015 . 19. World Health Organization . Physical activity . 2016 . http://www.who.int/mediacentre/factsheets/fs385/en/ . Accessed May 3, 2017. 20. Sequeira MM , Rickenbach M , Wietlisbach V , Tullen B , Schutz Y . Physical activity assessment using a

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Alexander H.K. Montoye, Kimberly A. Clevenger, Kelly A. Mackintosh, Melitta A. McNarry and Karin A. Pfeiffer

). Application and validation of activity monitors’ epoch lengths and placement sites for physical activity assessment in exergaming . Journal of Clinical Medicine, 7 ( 9 ), E268 . PubMed ID: 30208567. doi:10.3390/jcm7090268 10.3390/jcm7090268 John , D. , & Freedson , P. ( 2012 ). ActiGraph and Actical

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Tina Smith, Sue Reeves, Lewis G. Halsey, Jörg Huber and Jin Luo

adaptation. Generally, pedometers have been regarded as less accurate than accelerometers in physical activity assessment 24 , 25 and are affected by increasing body mass index (BMI) and waist circumference, and greater pedometer tilt in overweight and obese adults leading to an underestimation of actual

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Nathan H. Parker, Rebecca E. Lee, Daniel P. O’Connor, An Ngo-Huang, Maria Q.B. Petzel, Keri Schadler, Xuemei Wang, Lianchun Xiao, David Fogelman, Richard Simpson, Jason B. Fleming, Jeffrey E. Lee, Ching-Wei D. Tzeng, Sunil K. Sahai, Karen Basen-Engquist and Matthew H.G. Katz

Community Survey. Zip code-level estimates were used in place of census tracts because several patients’ mailing addresses in the electronic medical record were post office boxes. 43 Exercise and Physical Activity Assessment Exercise Assessment Patients were instructed to complete an exercise log for each

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Gregory Knell, Henry S. Brown, Kelley P. Gabriel, Casey P. Durand, Kerem Shuval, Deborah Salvo and Harold W. Kohl III

limited. 4 , 5 Within these studies, there is wide variation in the quality of the physical activity assessment. Some have used self-reports or direct observations that have well-documented measurement properties, 6 – 8 whereas others did not assess physical activity directly, 9 – 11 or they utilized