Accuracy of head circumference measurement: an analysis using different measuring tapes

Precisão da medida do perímetro cefálico: análise por diferentes fitas métricas

Abstract

Abstract  The aim of this study was to determine the accuracy of measuring tapes and head circumference measurements, analyzing four commercial measuring tapes available on the market. The research included technical analysis of four measuring tape models in the laboratory and their practical application on a training mannequin. Each tape was measured 10 times at two intervals with a calibrated digital caliper in the laboratory. The absolute and relative technical error of measurement (TEM) was calculated, considering deviations between measurements and true values. Tape 3 had the highest TEM, while tape 4 stood out for greater accuracy. The practical application had a training workshop with 25 students. Each participant measured the head circumference three times with each tape and compared them to a standard evaluator’s measurements. Tapes 2 and 4 had more accurate results, while tapes 1 and 3 had greater TEM. Regarding usability, tape 3 was the most difficult to handle, while tapes 1 and 4 were more practical (although tape 1 was considered long), and tape 3 was difficult to fit. It is crucial to standardize measuring tapes and techniques to ensure accurate and consistent measurements. It is recommended to use tapes made of non-stretchable material and to respect the usage time. It is also essential to train professionals constantly for multidisciplinary monitoring, ensuring accurate measures and the effective use of Personal Child Health Records to monitor child growth.

Key words:
Anthropometry; Child development; Growth; Newborn; Pediatrics