Bone mineral content, not bone mineral density, is the correct bone measure for growth studies.
Heaney
Robert P
RP
D015519:Bone Density / Q000502:physiology*; D002648:Child; D005260:Female; D006801:Humans; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood*
D014807:Vitamin D; C104450:25-hydroxyvitamin D