Szukana fraza: [Abstract = "Within 15 years, an increase in body mass was noted in all age groups of girls, with differences between them being statistically insignificant \(with the exception of 8\-9\- and 18\-year\-old girls\). In the case of boys, a significant increase in body mass was noted at the ages of 8 and 11\-18. Secular changes in the mass and height proportions in the studied pupils aged 7\-18 point out to a significant increase in body thickness among boys at the ages of 9 and 11\-18, and among girls at the ages of 8\-10, 12\-13, and 16\-17. The pubescent leap in body height in the girls examined between 2002 and 2017 occurred at 11\-12 years of age. In boys, the leap occurred at the age of 12\-13, and showed lower values in 2017."]

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