阴茎的伸展长度低于相同年龄或性发育状态人群平均值2.5SD者谓之阴茎过小。这是一种临床体征,不是综合征,不包括有外阴畸形的患者。充分伸展的阴茎体长度与勃起长度之间存在一个非常显著相关的系数0.983,而阴茎的疲软长度则差异很大。阴茎直径的测量亦不够准确,故评价阴茎过小程度的标准主要是用长度测量时以姆指和食指握持龟 Penis stretch less than the same age or sexual development of the population average of 2.5SD that the penis is too small. This is a clinical sign, not a syndrome, not including patients with genital malformations. There was a very significant correlation coefficient of 0.983 between fully extended penis length and erectile length, while penile weakness varied widely. Penis diameter measurement is not accurate enough, so the evaluation criteria for the penis is mainly used to measure the length of the thumb and the index finger to hold the turtle