Ethnic and sex differences in skeletal maturation among the Birth to Twenty cohort in South Africa.
Bottom Line: Within girls, there were no ethnic differences in the pattern or timing of skeletal maturity.Within boys, however, skeletal maturity was delayed by 7 months in black compared with white ethnicity.The delayed maturity of black boys, but not black girls, supports the hypothesis that boys have greater sensitivity to environmental constraints than girls.
Affiliation: Population Policy and Practice Programme, UCL Institute of Child Health, London, UK.Show MeSH
Mentions: The SITAR analyses used all the serial bone scores by age. Figure 1 shows the RUS score growth curves for boys by ethnic group, with unadjusted and adjusted curves for individual tempo and velocity. Figure 1A illustrates the range of almost 4 years in maturity timing for white boys and their varying rates of maturation. The range for black boys is wider (figure 1C), due, in part, to their larger numbers. The earlier rising curves tend to be steeper, corresponding to a negative correlation between tempo and velocity. The log transformation for age adjusts for this, as on the log age scale, the curves are more parallel and the tempo–velocity correlation closer to zero.
Affiliation: Population Policy and Practice Programme, UCL Institute of Child Health, London, UK.