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American Journal of Clinical Nutrition, Vol. 69, No. 6, 1289, June 1999
© 1999 American Society for Clinical Nutrition

Letters to the Editor

Reports of total-body bone mineral density

Howard S Barden

Lunar Corporation 313 West Beltline Highway Madison, WI 53714

Dear Sir:

Reference data in children (465 observations in 148 children) for total-body bone mineral content and bone mineral density acquired with a DPX densitometer (Lunar Corp, Madison, WI) were reported recently in a paper by Maynard et al (1). The authors noted that the only other investigators to report means and SDs for total-body bone mineral density for specific ages and sexes were Boot et al (2). However, similar data were published by Lu et al (3) and Matkovic et al (4). The latter results are close to those of Maynard et al, suggesting that these data sets are representative of results that can be obtained with DPX scanners.

REFERENCES

  1. Maynard LM, Guo SS, Chumlea WC, et al. Total-body and regional bone mineral content and areal bone mineral density in children aged 8–18 y: the Fels Longitudinal Study. Am J Clin Nutr 1998;68:1111–7.[Abstract]
  2. Boot AM, de Ridder MAJ, Pols HAP, et al. Bone mineral density in children and adolescents: relation to puberty, calcium intake, and physical activity. J Clin Endocrinol Metab 1997;82:57–62.[Abstract/Free Full Text]
  3. Lu PW, Briody JN, Ogle GD, et al. Bone mineral density of total body, spine, and femoral neck in children and young adults: a cross-sectional and longitudinal study. J Bone Miner Res 1994;9:1451–8.[Medline]
  4. Matkovic V, Jelic T, Wardlaw GM, et al. Timing of peak bone mass in Caucasian females and its implication for the prevention of osteoporosis: inference from a cross-sectional model. J Clin Invest 1994;93:799–808.
 

Reply to HS Barden

L Michele Maynard, Wayne A Wisemandle, Shumei S Guo, Christine M Zeller, W Cameron Chumlea, Bradford Towne, Alex F Roche and Roger M Siervogel

Division of Human Biology Department of Community Health Wright State University School of Medicine 1005 Xenia Ave Yellow Springs, OH 45387

Dear Sir:

Our statement referenced by Barden was not intended to minimize the scientific merit of the work of Matkovic et al (1) and Lu et al (2), but rather to direct the reader to papers in which age- and sex-specific means and SDs for bone mineral content (BMC), bone mineral density (BMD), or both are provided. The aim of the report by Matkovic et al (1) was to determine the timing of peak bone mass and density in females. Therefore, data for BMC and BMD in females were fitted with segmented regression models and presented graphically by age. Specific means and SDs were not presented by Matkovic et al, nor were data available for males. To describe the cross-sectional changes in BMD in both sexes, including the timing and magnitude of peak BMD, Lu et al (2) graphically reported mean curves for BMD along with the 5% and 95% prediction limits. Although the data of Matkovic et al and Lu et al are not directly comparable with our data in terms of presenting age- and sex-specific means and SDs, approximate estimations indicate similarity of data. We agree with Barden that the data of Matkovic et al and Lu et al, as well as data presented by us (3) and by Boot et al (4), are representative of measurements obtained with DPX densitometers (Lunar Corp, Madison, WI).

REFERENCES

  1. Matkovic V, Jelic T, Wardlaw G, et al. Timing of peak bone mass in Caucasian females and its implication for the prevention of osteoporosis: inference from a cross-sectional model. J Clin Invest 1994;93:799–808.
  2. Lu PW, Briody JN, Ogle GD, et al. Bone mineral density of total body, spine, and femoral neck in children and young adults: a cross-sectional and longitudinal study. J Bone Miner Res 1994;9:1451–8.
  3. Maynard LM, Guo SS, Chumlea WC, et al. Total-body and regional bone mineral content and areal bone mineral density in children aged 8–18 y: the Fels Longitudinal Study. Am J Clin Nutr 1998;68:1111–7.
  4. Boot AM, de Ridder MAJ, Pols HAP, et al. Bone mineral density in children and adolescents: relation to puberty, calcium intake, and physical activity. J Clin Endocrinol Metab 1997;82:57–62.




This Article
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