Table 1.
Mean femoral bone mineral density (BMD) of 20–29-year-old men and women in NHANES 2005–2010, 2013–2014, and 2017–2018.
| Region of interest | Mean (gm/cm2) | SD (gm/cm2) | BMD cutoff values for | |
|---|---|---|---|---|
| Osteopenia | Osteoporosis | |||
| Men (n=1149) | ||||
| Total femur | 1.09 | 0.15 | 0.73-0.94 | <0.73 |
| Femoral neck | 0.97 | 0.14 | 0.61-0.83 | <0.61 |
| Trochanter | 0.82 | 0.13 | 0.50-0.69 | <0.50 |
| Intertrochanter | 1.28 | 0.17 | 0.86-1.11 | <0.86 |
| Women (n=1062) | ||||
| Total femur | 0.97 | 0.13 | 0.65-0.84 | <0.65 |
| Femoral neck | 0.89 | 0.13 | 0.56-0.76 | <0.56 |
| Trochanter | 0.72 | 0.11 | 0.44-0.61 | <0.44 |
| Intertrochanter | 1.14 | 0.15 | 0.77-0.99 | <0.77 |
For each of the four regions of interest, low bone density was defined as: (1) osteopenia: a BMD value between 1 standard deviation (SD) and 2.5 SD below the mean of men or women age 20–29 years; and (2) osteoporosis: a BMD value >2.5 SD below the young reference mean.