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. 2009 Apr 24;106(17):295–304. doi: 10.3238/arztebl.2009.0295

Table 1. Chronological age at the onset of pubertal development in girls (Tanner stages). Mean, standard deviation (SD), and normal range of the initial development of signs of puberty (–2SD to +2SD)*1.

Parameter Mean SD Normal range (years)
(years) (years) (–2SD to +2SD)
PH 2 10.4 1.2 8.0 12.6
B 2 10.9 1.2 8.5 13.3
PHV 12.2 1.0 10.2 14.2
Menarche 13.4 1.1 11.2 15.6

*1modified from (3)

B = breast development; PH = development of pubic hair; PHV = peak height velocity, i.e., the time when longitudinal growth during puberty is fastest