passages.id: split_6_test_822_passage
passages.type: progene_text
passages.text: Serum concentrations of bone specific alkaline phosphatase ( BALP ) and osteocalcin ( bone Gla protein , BGP ) , urinary levels of pyridinoline ( Pyr ) and deoxypyridinoline ( Dpyr ) and computed tomography ( CT ) measurements of the cross - sectional areas of the vertebrae and the femurs , the apparent density of cancellous bone in the vertebrae , and the volume and the material density of cortical bone in the femurs were determined in 126 boys and 143 girls , ages 7 - 18 years .