title: Characteristics associated with requested and required accelerometer wear in children.
abstract: OBJECTIVE
  To investigate characteristics associated with wearing an accelerometer for the required and requested time among 8-year-old to 10-year-old children.
  
  
  METHODS
  Cross-sectional.
  
  
  METHODS
  60 Bristol and North Somerset primary schools taking part in the 'Active for Life Year 5' randomised controlled trial (RCT) in 2011.
  
  
  METHODS
  2048 children, aged 8-10 years, invited to wear an accelerometer for 5 days of recording.
  
  
  METHODS
  Numbers meeting required wear-time for inclusion in main RCT analysis (≥8 h/day ≥3 days) and numbers meeting requested wear-time (≥8 h/day for all 5 days).
  
  
  RESULTS
  817 (40%) of the children wore the accelerometer for the requested time and 1629 (80%) for the required time. In adjusted multivariable analyses the odds of wearing the accelerometer for the required time were greater in females as compared with males (OR 1.76 (1.42-2.18)), those with higher scores for reporting their mother restricted time on sedentary behaviours (1.26 (1.04-1.52) per increase of 1 on a 1-4 scale) and in children from schools with larger year group sizes (1.01 (1.00-1.02) per additional child). Living in a neighbourhood with higher levels of deprivation (0.49 (0.33-0.72) comparing highest to lowest third of the deprivation score) or reporting higher levels of weekday outdoor play (0.97 (0.94, 1.00) per 30 min more) were associated with reduced odds of meeting required time. Results were essentially the same for requested wear-time. Other characteristics, including child body mass index, were not associated with required or requested wear-time.
  
  
  CONCLUSIONS
  Only 40% of children wore the accelerometer for the requested time but 80% fulfilled the required criteria to be included in the main study analyses. Knowing which characteristics are associated with accelerometer wear could help target interventions to increase wear-time.
authors: School of Social & Community Medicine, University of Bristol, Bristol, UK.
authors: Sian L
authors: SL
authors: Wells
authors: Ruth R
authors: RR
authors: Kipping
authors: Russell
authors: R
authors: Jago
authors: Judith
authors: J
authors: Brown
authors: Daniel
authors: D
authors: Hucker
authors: Ali
authors: A
authors: Blackett
authors: Debbie A
authors: DA
authors: Lawlor
keywords: Epidemiology; Public Health; Sports MEdicine
references: Arch Dis Child. 2008 Jul;93(7):614-9
references: 18305072
references: Exerc Sport Sci Rev. 2001;29(1):32-6
references: 11210445
references: Epidemiology. 2004 Sep;15(5):615-25
references: 15308962
references: Prev Med. 2004 May;38 Suppl:S60-8
references: 15072860
references: Med Sci Sports Exerc. 2005 Nov;37(11 Suppl):S544-54
references: 16294117
references: Pediatr Exerc Sci. 2007 Aug;19(3):252-66
references: 18019585
references: BMJ. 2009 Nov 26;339:b4544
references: 19942665
references: Am J Health Promot. 2006 Jul-Aug;20(6):422-8
references: 16871822
references: J Phys Act Health. 2008;5 Suppl 1:S98-111
references: 18364528
references: Lancet. 2006 Jul 22;368(9532):299-304
references: 16860699
references: JAMA. 1999 Oct 27;282(16):1561-7
references: 10546696
references: BMJ Open. 2013 Mar 01;3(3):
references: 23457328
references: Med Sci Sports Exerc. 2005 Nov;37(11 Suppl):S531-43
references: 16294116
references: J Pediatr. 2005 Jun;146(6):732-7
references: 15973308
references: BMJ. 2000 May 6;320(7244):1240-3
references: 10797032
references: Med Sci Sports Exerc. 2005 May;37(5):867-71
references: 15870643
references: J Appl Physiol (1985). 2008 Sep;105(3):977-87
references: 18635884
references: Med Sci Sports Exerc. 2009 Sep;41(9):1816-25
references: 19657287
references: Prev Med. 1997 Mar-Apr;26(2):241-7
references: 9085394
references: Trials. 2011 Jul 24;12:181
references: 21781344
references: J Phys Act Health. 2009;6 Suppl 1:S148-55
references: 19998861