No More Hot Flashes... and Even More Good News by Penny Wise Budoff

Author:Penny Wise Budoff [BUDOFF, PENNY WISE]
Language: eng
Format: epub
ISBN: 9780446569552
Publisher: Grand Central Publishing
Published: 2009-11-29T00:00:00+00:00

Reprinted by permission of PREVENTION Magazine. Copyright 1996 Rodale Press, Inc. All rights reserved.

BMD, by any of the techniques, gives three results for each site. These are an absolute value, expressed as grams of bone mineral per unit; a comparison to age- and sex-matched controls, or “normals“; and a comparison to young “peak” bone mass at age thirty. The results may be expressed as a percentage of normal, or as a standard deviation score, or distance from the mean value on the bell-shaped curve of normals. At first it does not make sense to compare a woman who may be fifty, sixty, or seventy years old with women aged thirty. The explanation is based on understanding that by age seventy to seventy-five, about 50 percent of all women already have thinned bones and are at risk for fractures. If we compare a seventy-five-year-old woman with other seventy-five-year-old women, she may be “average” for her own age group—but average at seventy-five is already high risk for fractures! We therefore compare women with an ideal group, thirty-year-old women, who do not suffer from these fractures. This comparison, when expressed as a standard deviation, is called a T-score.

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