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The main objective of the research study was to investigate the onset of menarche and the use of hormonal contraception in girls in the Olomouc Region, to compare the results of the research with other studies, and to confirm or disprove the secular trend in girls in the area of menarche. Partial objectives of the study are as follows: To find out whether girls in various age categories menstruate or not, to find out the age of menarche, to find out whether the cycle is regular or not, to find out after how many d...