Relationship between puberty growth and sexual development of boys / 中国学校卫生

ABSTRACT

Objective@#To analyze the characteristics of puberty growth of boys and to explore the relationship between puberty growth and sexual development of boys.@*Methods@#Pubertal development of boys from grade 1 to grade 4 in Jiulongpo district of Chongqing was followed up once every six months. The data of height, weight, BMI, the age of first ejaculation and testicular development of boys from baseline to follow-up every 6 months for 5 years were analyzed. Based on peak height velocity (PHV), the average level of PHV and age at peak height velocity(PHA) were analyzed. ANOVA was used to compare the height growth rate of boys in different age groups before and after the first ejaculation. Kendall rank correlation was used to analyze the relationship between different stages of testicular development and BMI.@*Results@#The mean age of PHA was (11.72±1.03) years in adolescent height speed cohort, and the mean age of first ejaculation was (12.45±0.98) years before and after the first ejaculation cohort. There was significant difference in the increment of height before and after one year of the age of first ejaculation (P<0.05), the younger the age of the first ejaculation, the greater increase of height in the following year. The height, weight, BMI of boys aged 11 to 14 years were positively correlated with testicular volume(P<0.05).@*Conclusion@#The height growth of boys reached its peak one year before the first ejaculation, and began to decrease after first ejaculation, and the age of the first ejaculation of boys was negatively correlated with the increment of height in the following year, while the testicular development of boys was positively correlated with height, weight and BMI.