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Secondary sexual characteristics psychology

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Copyright American Secondary sexual characteristics psychology Association. The sample included white, African American, and Mexican American boys. All 3 groups were significantly taller and heavier than boys in previous NHANES reports and showed earlier genital maturation and pubic hair growth than previous studies based on Tanner staging.

Additional studies are required to further evaluate these findings and to explore the public health implications. Ina study on girls found significant differences in the age of onset of pubertal characteristics by race and also found that the mean age of onset was younger compared with findings from the last 30 to 40 years.

Numerous studies worldwide have shown that the onset of pubertal characteristics varies with race and ethnicity, environmental conditions, geographical location, and nutrition 12 ; thus, current geographically representative data on boys in the United States are needed. The findings of earlier studies regarding racial differences in pubertal timing between African American and white boys are conflicting.

Previous US studies do not provide descriptive data that are generalizable to the entire population owing to the times of the studies, 6 small sample sizes, 67 racial limitations, 5 - 7 differences in methods, 4 and older ages at entry into the studies.

This cross-sectional survey had a stratified, Secondary sexual characteristics psychology probability design. Although the survey was conducted in 2 phases, it was designed so that the total sample was representative of boys in the United States. This survey did not collect data on gynecomastia, voice change, undescended testes, or facial hair growth. All training and assessment followed the protocol detailed below, used in previous NHANES surveys from which prior pubertal studies have been published.

In a similar manner, the 8 primary physicians and the back-up physicians who examined the children were trained in conducting sexual maturity ratings by an expert in adolescent medicine using discussion, text, and visual aids.

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