Agreement between measured weight, height and BMI and Web-based self-reported data in participants of the 1993 Pelotas Birth Cohort, Brazil: a cross-sectional validation study

Concordancia entre medidas de peso, talla e IMC autoinformadas en internet en participantes de la Cohorte de Nascimiento de Pelotas de 1993, Brasil: estudio de validación transversal

ABSTRACT

Objective:

to evaluate the agreement between measured height, weight, and body mass index (BMI) during the 22-year follow-up of the 1993 Pelotas Birth Cohort, state of Rio Grande do Sul, Brazil, and self-reported data during the online follow-up of the coortesnaweb.

Methods:

this was a cross-sectional validation study; agreement was assessed by means of Lin’s concordance correlation coefficient for continuous measures and weighted Kappa for nutritional status; Spearman’s rank correlation coefficient was used to estimate the correlation between measurements.

Results:

a total of 783 participants were included; it could be seen high correlation and high agreement between the measured height (r = 0.966; ρ = 0.966), weight (r = 0.934; ρ = 0.928), and BMI (r = 0.903; ρ = 0.910) and Web-based self-reported data; there was no correlation between mean difference and the time interval between measurements.

Conclusion:

using the Internet to collect self-reported anthropometric measurements is as valid as the traditional method.

Keywords:
Validation Study; Body Weights and Measures; Body Mass Index; Measurement of Correlation.