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Metrics details. The growth of children is an indicator of health and society's wellbeing. Growth references are useful in monitoring a child's growth, which is a very important part of child care. Poland's growth references are not updated regularly. Although several growth reference ranges have been developed in Poland over recent years, sampling was restricted to urban populations of major cities. The aim of this study was to assess how well Polish children match with, or diverge from, regional charts and to compare them with international growth references.
Four Polish and two international WHO and USCDC growth references were used to calculate the height, weight and BMI z-scores in a recent, large, population-representative sample of school-aged children and adolescents in Poland. The distributions of z-scores were analysed with descriptive and inferential statistical methods.
Mean height z-scores calculated with the use of the WHO and USCDC references were positive and significantly different from zero over the entire age range. The mean height z-score was closest to zero in the Poznan reference for boys 0. Median weight z-scores were positive under all weight references over the entire age range with only the exception of year-old girls' weight z-score calculated relative to USCDC Median BMI z-scores were positive in males in early childhood, decreasing with age.
Median BMI z-scores calculated with the use of the Lodz reference fluctuated between 0. In this contemporary sample of Polish school-aged children, distributions of height, weight and BMI differed from those of children from the international growth references. These differences should be considered when using the references.
