Males 
<5 years: 19-75
5-9 years: 21-108
10-15 years: 19-159
16-17 years: 12-114
> or =18 years: 9-42
Females
<5 years: 14-126
5-9 years: 16-152
10-15 years: 15-151
16-17 years: 9-70
> or =18 years: 9-42
Elevated levels of osteocalcin indicate
increased bone turnover.