Stretched Penile Length and Testicular Size from Birth to 18 Years in Boys from Western Maharashtra

BACKGROUND: Genital stage and testicular volume examination and assessment are essential for assessment of growth puberty in boys. There is paucity of Indian data for penile and testicular parameters particularly in pubertal years. AIM: The aim of this study is to present normative data for penile length, testicular volume, and testicular length from birth to 18 years in boys from western Maharashtra and to correlate these parameters with sexual maturity staging (SMR) (Tanner staging). MATERIALS AND METHODS: A cross-sectional observational study was undertaken in apparently healthy boys from 0 to 18 years of age from western Maharashtra from October 2016 to October 2017. Age, anthropometric parameters, stretched penile length (SPL), testicular volume, and testicular length were measured. Pubertal stage was categorized using Tanner staging. Data were entered in Microsoft excel 2013 and using SPSS version 16. LMS method was used to construct age-specific Z-scores for SPL, testicular volume, and testicular length. RESULTS: A total of 843 boys were enrolled in the study. Mean SPL was 4.1 ± 0.4, 5.4 ± 0.8, and 10.2 ± 1.7 cm at 1, 10, and 18 years of age, respectively, and showed a gradual rise from birth to 18 years. Mean testicular volume was 1.8 ± 0.5, 3.3 ± 1.2, and 24.1 ± 3.5 ml, whereas testicular length was 1.3 ± 0.4, 2.1 ± 0.5, and 4.4 ± 0.7 cm respectively, at 1, 10, and 18 years, respectively. The magnitude of increase for SPL and testicular volume was greater around 9–10 years. The increase in SPL and testicular size was hand in hand with SMR for genital development as well as for axillary and pubic hair stages. CONCLUSION: Normative data on SPL, testicular volume, and testicular length from western Maharashtra are presented. These data may be useful in disorders of puberty and genitalia in boys.