Secular Trends in Height Among Children During 2 Decades

David S. Freedman, Laura Kettel Khan, Mary K. Serdula, Sathanur R. Srinivasan, Gerald S. Berenson
2000 Archives of Pediatrics & Adolescent Medicine  
Participants: All schoolchildren residing in Bogalusa, La, were eligible. A total of 24 070 examinations were performed. Results: During the study period, the mean height of schoolchildren increased by 0.70 cm per decade independently of race, sex, and age. Trends were most pronounced among preadolescents, blacks, and boys, with 9-to 12-year-old black boys showing a height increase of 1.8 cm per decade. We observed a decrease in the number of relatively short children (Ͻ10th percentile of
more » ... ) and an increase in the number of tall children (Ͼ90th percentile of height). Because a secular trend was not seen among the 15-to 17-year-old children, our findings likely reflect an acceleration of maturation. Conclusions: It has generally been assumed that secular increases in height among schoolchildren in the United States ceased by the mid-1900s. Our findings, which may be due to various environmental factors, demonstrate that care must be taken when using nonconcurrent reference data to assess the growth of children. Additional study is needed to determine if these secular trends are continuing and to examine possible explanations and consequences of these trends.
doi:10.1001/archpedi.154.2.155 pmid:10665602 fatcat:22hjc6pvpjfepewseyqabhnfpe