 The database will be developed in the program Access. The results will be reported as mean and standard deviation and minimum and maximum values for each age group by Tanner stage, if the data are normally distributed. Non-normally distributed data will be given as median and confidence intervals as well as minimum and maximum values for each Tanner stage. Data for previously studied children with suspected precocious puberty, will be reported in the same way. Statistical comparison between the groups will be made with u-paired t-test or equivalent non-parametric test, if the data is not normally distributed. 