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The “Lasso-o” tape: stretchability and observer variability in head circumference measurement
  1. J L Bartram1,
  2. A S Rigby2,
  3. P S Baxter1
  1. 1Sheffield Children’s Hospital, UK
  2. 2Academic Cardiology, University of Hull, UK
  1. Correspondence to:
    Dr J L Bartram
    Sheffield Children’s Hospital, Western Bank, Sheffield S10 2TH, UK;


Head circumference is an important clinical measurement in children. The stretchability of the Lasso-o tape and the intra- and inter-observer reproducibility of measurements using it were investigated. Old Lasso-o tapes stretch significantly. The intra-class coefficients were 0.999 for intra-observer and 0.979 for inter-observer measurements. Nonetheless in 9% of measurements inter-observer variability was over 1 cm.

  • head circumference
  • measurement
  • observer variability
  • reliability

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  • Competing interests: none declared