Significant increase in 25 anthropometric variables of the Slovak and Czech population in time are defined in the paper. A total of 691 respondents from Slovakia and 688 from the Czech Republic were analyzed. Arithmetic means and standard deviations to characterize the anthropometric variables and their variation were defined and compared. Subsequently, quantiles of the selected anthropometric measurements of the adult male and female population in individual countries in the year 2004 and newly determined quantiles in the year 2018 were calculated and compared. Following the results, the fact that secular trend has stabilized and differences in population between individual countries have minimized over the course of the last 14 years can be stated.