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

Table 2. Chronological age at the onset of pubertal development in boys (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)
G 2	11.2	1.5	8.2	14.2
Testicular volume (≥ 3 mL)	11.9	0.9	10.1	13.7
PH 2	12.2	1.5	9.2	15.2
Spermarche	13.4	—	11.7	15.3
PHV	13.9	0.8	12.3	15.5

^*1Modified from (4) and (10)

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

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

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