Horlick et al used results of total body dual energy X-ray absorptiometry (DEXA) to calculate the bone mass of children and adolescents. The authors are from St. Luke's-Roosevelt Hospital Center, Children's Hospital of New York Presbyterian, and Columbia University in New York City.
Subjects: 6 to 18 years
Imaging: total body DEXA
Parameters:
(1) age in years
(2) gender
(3) height in centimeters
(4) body weight in kilograms
(5) race
(6) total body bone area (TBBA) in square cm
total body bone mineral density in grams per square cm =
= 1 / ((gender and weight based formula) + (intercept based on gender, weight and race))
|
Gender |
Weight |
Formula |
|
female |
< 35 kg |
(0.088*(age)) - (0.008*((age)^2)) + (0.0002*((age)^3)) - (0.071*LN(weight)) + (0.003*(height)) - (0.516*LN(TBBA)) |
|
female |
>= 35 kg |
(0.088*(age)) - (0.008*((age)^2)) + (0.0002*((age)^3)) - (0.071*LN(weight)) + (0.005*(height)) - (0.516*LN(TBBA)) |
|
male |
< 35 kg |
(0.023*(age)) - (0.001*((age)^2)) + (0.003*(height)) - (0.491*LN(TBBA)) |
|
male |
>= 35 kg |
(0.023*(age)) - (0.001*((age)^2)) - (0.074*LN(weight)) + (0.003*(height)) - (0.491*LN(TBBA)) |
Intercept
|
Race |
Female and < 35 kg |
Female and >= 35 kg |
Male and < 35 kg |
Male and >= 35 kg |
|
Asian |
4.173 |
4.153 |
4.114 |
4.362 |
|
Black |
4.130 |
4.109 |
4.095 |
4.343 |
|
Hispanic |
4.151 |
4.130 |
4.109 |
4.356 |
|
White |
4.355 |
4.334 |
4.121 |
4.369 |
|
other |
4.165 |
4.145 |
4.123 |
4.370 |
