title: The sensitivity and specificity of an activity monitor in detecting functional activities in young people with cerebral palsy.
abstract: OBJECTIVE
  To evaluate the sensitivity and specificity of the Intelligent Device for Energy Expenditure and Activity (IDEEA) monitor in detecting functional activities in young people with cerebral palsy (CP).
  
  
  METHODS
  Validation study.
  
  
  METHODS
  Two identical data collections completed 1 week apart at a gait laboratory.
  
  
  METHODS
  Twenty-five young people with CP and 30 able-bodied (AB) peers (age 8-25 y; mean age CP 14.1 y, Gross Motor Function Classification System Level I-III; mean age AB, 14.2 y).
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Each participant completed 5 functional activities (sitting, lying, standing, walking, and stairs), with the monitor attached. The sensitivity and specificity of the monitor in detecting each activity was calculated by comparison to a written timed report.
  
  
  RESULTS
  Sitting, lying, and standing were detected with median 100% sensitivity in both participant groups and across both testing sessions. Accuracy of walking detection was reduced compared with static activities (P<.05) across the 2 sessions and groups. The CP group had a significantly higher number of participants where the activity was not detected with 100% sensitivity (lie: 18% CP, 5% AB, P<.04; stand: 12% CP, 0% AB, P<.02; walk: 96% CP, 81% AB, P<.03). Stair climbing was detected in only half of the 12 participants with CP who could achieve the task. The IDEEA demonstrated high specificity (range, 97%-100%) for both participant groups.
  
  
  CONCLUSIONS
  The IDEEA activity monitor had high levels of sensitivity and specificity in determining everyday static activities in participants with CP, with greater difficulties in detecting dynamic activities of walking and stair climbing.
authors: Department of Surgery, University of Auckland, Auckland, New Zealand. a.mackey@auckland.ac.nz
authors: Anna H
authors: AH
authors: Mackey
authors: Penelope
authors: P
authors: Hewart
authors: Sharon E
authors: SE
authors: Walt
authors: N Susan
authors: NS
authors: Stott
mesh_terms: D000054:Acceleration; D000293:Adolescent; D001696:Biomechanical Phenomena; D002547:Cerebral Palsy / Q000503:physiopathology*; D002648:Child; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D009520:New Zealand; D012680:Sensitivity and Specificity; D012984:Software; D018709:Statistics, Nonparametric; D055815:Young Adult