Validation of predictive equations for weight and height using a metric tape
2008
Weight and height measurements are important data
for the evaluation of nutritional status but some situations
prevent the execution of these measurements in the
standard manner, using special equipment or an estimate
by predictive equations. Predictive equations of height
and weight requiring only a metric tape as an instrument
have been recently developed.
Objective: To validate three predictive equations for
weight and two for height by Rabito and evaluating their
agreement with the equations proposed by Chumlea.
Methods: The following data were collected: sex, age
and anthropometric measurements, ie, weight (kg),
height (m), subscapular skinfold (mm), calf (cm), arm
(cm) and abdominal (cm) circumferences, arm length
(cm), and half span (cm). Data were analyzed statistically
using the Lin coefficient to test the agreement between the
equations and the St. Laurent coefficient to compare the
estimated weight and height values with real values.
Results: 100 adults (age 48 ± 18 years) admitted to the
University Hospital (HCFMRP/USP) were evaluated.
Equations I: W(kg) = 0.5030 (AC) + 0.5634 (AbC) +
1.3180 (CC) +0.0339 (SSSF) – 43.1560 and II: W (kg) =
0.4808 (AC) + 0.5646 (AbC) +1.3160 (CC) – 42.2450 showed
the highest coefficients of agreement for weight and
equations IV and V showed the highest coefficients of
agreement for height. The St. Laurent coefficient indicated
that equations III and V were valid for weight and
height, respectively.
Conclusion: Among the validated equations, the number
III W (kg) = 0.5759 (AC) + 0.5263 (AbC) +1.2452 (CC)
– 4.8689 (S) – 32.9241 and VH (m) = 63,525 -3,237(S) –
0,06904 (A) + 1,293 (HS) are recommended for height or
weight because of their easy use for hospitalized patients
and the equations be validated in other situations.
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