The validity of parental-reported body height and weight: a comparison with objective measurements of 7-8-year-old Czech children

Abstract

The values of body weight and height can be recorded in various ways. Self-reports and parentalreport methods are amongst the most typical ways to collect data. These methods have advantages, but also limits. Anthropometric measures are recommended to improve measurement precision. The aim of this study was to investigate whether the parental-reported body weight and height of 7-8-year-old Czech children corresponded with the measured body weight and height. Data concerning children’s body weight and body height were collected via parental informed consent and anthropometric measurements. The research sample consisted of 388 children from 7 to 8 years-old (boys, n = 176; girls, n = 162). Only children with parental informed consent were included. Correlations between parental-reported and measured data were analysed with the Pearson correlation coefficient to examine the strength of linear dependence between the two methods. The differences between parental-reported and measured data were tested using the Wilcoxon signed-rank test. P-values below α = 0.05 were considered statistically significant. Parents manifested a tendency to underestimate body weight and especially the body height of their children. This trend was seen in boys and girls in both age groups. Out of the 338 children with parent-reported height, parents under-reported their child’s height by 1 cm or more in 37.1% of the children, 39.6% of the parents reported a height within 0.99 cm of the measured height, and 23.3% of parents over-reported their child’s height by 1 cm or more. The same number of children had parentreported weights, parents under-reported their child’s weight by 1 kg and more in 25.2% of the children, 57.7% of the parents reported a weight within 0.99 kg of the measured weight, and 17.1% of the parents over-reported their child’s weight by 1 kg or more. The Pearson correlation coefficient between the measured and parental-reported height and weight revealed a statistically significant strong positive linear relationship in both genders (rheight = 0.912, rweight = 0.943; all p< 0.001). The differences between the measured and parental-reported height and weight were not significantly different (all p< 0.05). The high agreement and correlation between measured and parental-reported body height and weight suggest that parental-report methods can be an appropriate alternative to objective measurement and can be used as a valid tool to classify body height and weight for large population studies of Czech children in school-based research when anthropometric measures are not available.