mited to stages 3 to 5 (be-cause NHES III included children 12 to 17, consideredtoo old to estimate stage 2 reliably) and Mexican Amer-ican children from HHANES. The authors concluded thatthere is no evidence of an earlier puberty (as measuredby median ages of Tanner stages 3–5) during the timespanning the 3 surveys (1960s through 1990s) for eithernon-Hispanic black or white girls but “some evidence”for Mexican American girls between 1982 and 1994. Anadvantage of this study is the consistent reanalysis ofdata from 3 national surveys. Disadvantages of the anal-ysis are the exclusion of information on onset (Tannerstage 2), which many consider to be the key puberty-timing issue of concern, and decreased study power as aresult of limiting the sample sizes for comparison
So this study shows that there is no puberty change fore ages 12-17? The concern is puberty onset, not general maturation, meaning it is not applicable?