title: Test-retest reliability of computer-based video analysis of general movements in healthy term-born infants.
abstract: BACKGROUND
  A computer-based video analysis has recently been presented for quantitative assessment of general movements (GMs). This method's test-retest reliability, however, has not yet been evaluated.
  
  
  OBJECTIVE
  The aim of the current study was to evaluate the test-retest reliability of computer-based video analysis of GMs, and to explore the association between computer-based video analysis and the temporal organization of fidgety movements (FMs).
  
  
  METHODS
  Test-retest reliability study.
  
  
  METHODS
  75 healthy, term-born infants were recorded twice the same day during the FMs period using a standardized video set-up.
  
  
  METHODS
  The computer-based movement variables "quantity of motion mean" (Qmean), "quantity of motion standard deviation" (QSD) and "centroid of motion standard deviation" (CSD) were analyzed, reflecting the amount of motion and the variability of the spatial center of motion of the infant, respectively. In addition, the association between the variable CSD and the temporal organization of FMs was explored. Intraclass correlation coefficients (ICC 1.1 and ICC 3.1) were calculated to assess test-retest reliability.
  
  
  RESULTS
  The ICC values for the variables CSD, Qmean and QSD were 0.80, 0.80 and 0.86 for ICC (1.1), respectively; and 0.80, 0.86 and 0.90 for ICC (3.1), respectively. There were significantly lower CSD values in the recordings with continual FMs compared to the recordings with intermittent FMs (p<0.05).
  
  
  CONCLUSIONS
  This study showed high test-retest reliability of computer-based video analysis of GMs, and a significant association between our computer-based video analysis and the temporal organization of FMs.
authors.affiliation: Department of Occupational and Physiotherapy, Skien Municipality, Ergo-og fysioterapitjenesten, Skien Kommune, Kongensgate 31, Postboks 158, 3731 Skien, Norway. Electronic address: susanne_collier_valle@hotmail.com.
authors.forename: Susanne Collier
authors.initials: SC
authors.lastname: Valle
authors.affiliation: Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology (NTNU), Medical Faculty, P.O. Box 8905, 7491 Trondheim, Norway; Department of Pediatrics, St. Olavs Hospital HF, P.O. Box 3250 Sluppen, 7006 Trondheim, Norway. Electronic address: ragnhild.stoen@ntnu.no.
authors.forename: Ragnhild
authors.initials: R
authors.lastname: Støen
authors.affiliation: Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology (NTNU), Medical Faculty, P.O. Box 8905, 7491 Trondheim, Norway; Department of Pediatrics, St. Olavs Hospital HF, P.O. Box 3250 Sluppen, 7006 Trondheim, Norway. Electronic address: rannei.sather@ntnu.no.
authors.forename: Rannei
authors.initials: R
authors.lastname: Sæther
authors.affiliation: Department of Musicology, P.O. Box 1017 Blindern, 0316 Oslo, Norway. Electronic address: a.r.jensenius@imv.uio.no.
authors.forename: Alexander Refsum
authors.initials: AR
authors.lastname: Jensenius
authors.affiliation: Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology (NTNU), Medical Faculty, P.O. Box 8905, 7491 Trondheim, Norway; Clinics of Clinical Service, St. Olavs Hospital HF, P.O. Box 3250 Sluppen, 7006 Trondheim, Norway. Electronic address: lars.adde@ntnu.no.
authors.forename: Lars
authors.initials: L
authors.lastname: Adde
mesh_terms: D002547:Cerebral Palsy / Q000175:diagnosis* / Q000503:physiopathology; D002657:Child Development; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007223:Infant; D008297:Male; D009068:Movement; D015203:Reproducibility of Results; D012984:Software; D014741:Video Recording
keywords: Cerebral palsy; Computerized GM assessment; Fidgety movements; General movements; Neurodevelopmental assessment; Reliability