title: Physical activity screening to recruit inactive randomized controlled trial participants: how much is too much?
abstract: Screening physical activity levels is common in trials to increase physical activity in inactive populations. Commonly applied single-item screening tools might not always be effective in identifying those who are inactive. We applied the more extensive Active Australia Survey to identify inactive people among those who had initially been misclassified as too active using a single-item measure. Those enrolled after the Active Australia Survey screening had significantly higher physical activity levels at subsequent baseline assessment. Thus, more extensive screening measures might result in the inclusion of participants who would otherwise be excluded, possibly introducing unwanted bias.
  
  
  BACKGROUND
  Australian New Zealand Clinical Trials Registry, ACTRN12611000157976.
authors.affiliation: Physical Activity Research Group, School for Human Health and Social Science, Central Queensland University, Rockhampton, QLD, Australia. c.vandelanotte@cqu.edu.au.
authors.forename: Corneel
authors.initials: C
authors.lastname: Vandelanotte
authors.affiliation: School for Medical and Applied Sciences, Central Queensland University, Rockhampton, QLD, Australia. r.stanton@cqu.edu.au.
authors.forename: Robert
authors.initials: R
authors.lastname: Stanton
authors.affiliation: Physical Activity Research Group, School for Human Health and Social Science, Central Queensland University, Rockhampton, QLD, Australia. a.rebar@cqu.edu.au.
authors.forename: Amanda L
authors.initials: AL
authors.lastname: Rebar
authors.affiliation: Physical Activity Research Group, School for Human Health and Social Science, Central Queensland University, Rockhampton, QLD, Australia. a.vanitallie@cqu.edu.au.
authors.forename: Anetta K
authors.initials: AK
authors.lastname: Van Itallie
authors.affiliation: School of Health and Exercise Sciences, University of British Columbia, Kelowna, BC, Canada. cristina.caperchione@ubc.ca.
authors.forename: Cristina M
authors.initials: CM
authors.lastname: Caperchione
authors.affiliation: Priority Research Centre for Physical Activity and Nutrition, Faculty of Health and Medicine, School of Medicine and Public Health, University of Newcastle, Newcastle, NSW, Australia. mitch.duncan@newcastle.edu.au.
authors.forename: Mitch J
authors.initials: MJ
authors.lastname: Duncan
authors.affiliation: School of Science and Health, Western Sydney University, Sydney, NSW, Australia. t.savage@westernsydney.edu.au.
authors.forename: Trevor N
authors.initials: TN
authors.lastname: Savage
authors.affiliation: Department of Human Nutrition, Kansas State University, Manhattan, KS, USA. ricardo@ksu.edu.au.
authors.forename: Richard R
authors.initials: RR
authors.lastname: Rosenkranz
authors.affiliation: School of Science and Health, Western Sydney University, Sydney, NSW, Australia. g.kolt@westernsydney.edu.au.
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Kolt
mesh_terms: D056044:Actigraphy; D006304:Health Status; D006801:Humans; D009043:Motor Activity; D018579:Patient Selection; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D057185:Sedentary Behavior; D015983:Selection Bias; D011795:Surveys and Questionnaires; D016138:Walking