The status quo and probit analysis procedure was applied to determine means and standard deviations of the age at which Chilean children reach the Tanner-Whitehouse stages of bone maturation of the wrist and hand. Female children mature earlier, but not uniformly foi all bones. It seems that this situation is inverted in the intrauterine life, at least, for the hamate bone. Several X values that yield probabilities close to 1.0 and some of them that yield probabilities less than 0.001 show that the X2 test is not regular for these data. (Key words: Bone maturation, Chilean population)...
