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Tanner scale
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===Genitals (male)=== [[File:Male genitalia five Tanner stages.png|350px|thumb|Photos of the Tanner scale for males.]] ; Tanner I : [[Testicle|testicular]] volume less than 1.5 [[liter|ml]]; small [[Human penis|penis]] ([[Puberty|prepubertal]]) ; Tanner II : testicular volume between 1.6 and 6 ml; skin on scrotum thins, reddens and enlarges; penis length unchanged ; Tanner III : testicular volume between 6 and 12 ml; scrotum enlarges further; penis begins to lengthen ; Tanner IV : testicular volume between 12 and 20 ml; scrotum enlarges further and darkens; penis further increases in length and starts to increase in breadth ; Tanner V : testicular volume greater than or equal to 20 ml; adult scrotum and penis
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