The bone maturation of hand and wrist of boys and girls aged from 6 to 19 years belonging to a longitudinal follow-up study is described. They were taken from the middle, low-middle and low socioeconomic strata of the northern district of the Metropolitan Area. The evaluation was made by the Greulich and Pyle's Atlas and the Tanner and Whitehouse's TW2 method. No differences were found between this Chilean sample and that of an English study...
