Pubertal stages 1980 of Stockholm schoolchildren

Abstract

In March 1980 a cross-sectional study of the pubertal developmental of a sample of Stockholm schoolchildren was conducted. Breast development (B1-B5), pubic hair (PH1-PH5) and axillary hair (AH1-AH3) were rated in 138 girls, and genitalia development (G1-G5), pubic hair (PH1-PH5) and axillary hair (AH1-AH3) were rated in 116 boys according to the Tanner method. The girls' and the boys' ratings were done by one female and one male medically qualified expert respectively. When relating social class to age of pubertal stage no significant differences were found. Median ages for entry to successive pubertal stages as well as centiles were calculated by logistic regression. Girls were somewhat earlier in their breast and pubic hair development than Stockholm girls investigated in earlier studies; however, somewhat later in their development of axillary hair. The boys entered G2 earlier than boys studied in 1970 but entered G5 at exactly the same age, 15.1 years. Boys entered PH2 somewhat later than 1970 boys, but again reached PH5 at exactly the same age, 15.5 years. The present study is based on a more recent and somewhat larger sample of children drawn from a wider area of Stockholm than the earlier studies. It is further suggested that these values be used in the proposed new height and weight reference values for youth in Sweden.

Relationship of Lead, Mercury, Mirex, Dichlorodiphenyldichloroethylene, Hexachlorobenzene, and Polychlorinated Biphenyls to Timing of Menarche Among Akwesasne Mohawk Girls

“…Other studies that found no relationship involved well-off populations without threats to maturation from nutritional stress. 51,52 The Akwesasne Mohawk sample demonstrates no evidence of nutritional deficiency that would affect menarche, 53,54 and the observed relationship between menarche and SES fits the pattern observed for welloff samples.…”

“…Other studies that found no relationship involved well-off populations without threats to maturation from nutritional stress. 51,52 The Akwesasne Mohawk sample demonstrates no evidence of nutritional deficiency that would affect menarche, 53,54 and the observed relationship between menarche and SES fits the pattern observed for welloff samples.Here our focus was not on the relationship of SES to menarche but on the role of SES in influencing the relationship of lead and PCBs to menarche. In the present study, the removal of SES from the logistic regression model had little impact on the effects of age and toxicants on menarche (on the basis of changes in ␤ coefficients) or on the pseudo-variance explained (2.8% reduction in both Cox-Snell and Nagelkerke pseudo-R 2 ).…”

Sexuelle Reifung von Kindern und Jugendlichen in Deutschland

“…Jahrhunderts auf etwa 12,5-13 Jahre eingependelt [18,19,20,21,22,23]. Dieser Trend in der Veränderung des Menarchealters wird durch Untersuchungen sowohl für Deutschland als auch für andere europäische Länder bestätigt [2,6,17,19,24,25,26,27]. Ergebnisse der 1985 in den jetzigen neuen Bundesländern durchgeführten repräsentativen Reifestudie an ca.…”

Biomarkers for assessing reproductive development and health: Part 1--Pubertal development.

“…Investigators have handled such missing data in a number of ways, either by substituting the mean age for girls with known ages, or using grade in school and presumed chronological age assuming the girl entered school at 5 years of age and did not skip or repeat a grade. Other crude proxies of pubertal development in girls include presence/absence of axillary hair (Lindgren 1996). Although there is no direct analogy of age at menarche for boys, there is a Tanner scale for assessing pubertal stage in boys.…”