[TW systems in estimation of carpal bone age and their potential applications in diagnosis of idiopathic precocious puberty in Chinese girls].

Objective: To compare three assessment methods (TW2, TW2CH, and TW3) for carpal bone age and their potential applications in diagnosis of idiopathic precocious puberty (IPP) in Chinese girls.

Methods: Fifty-five (55) girls with IPP and 83 normal girls as control group were selected in this study. The X-ray films of the left hand-wrist taken at their first visit were analyzed retrospectively.