To assess how far an individual has progressed through puberty, a rating scale that describes the successive stages of growth of the genitalia and pubic hair in boys and breast development and pubic hair development in girls was introduced by Tanner (Fig. 10.2). The stage of development in the individual is compared with visual standards which are referred to as G-1 to G-5 for male genitalia development, B-1 to B-5 for breast development, and PH-1 to PH-5 for pubic hair development. The sequence and timing of stages is illustrated in Fig. 10.3.
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