TABLE 3.
Lumbar spine bone mineral density by age category.
| Age 3 to <4 y | Age 4 to <5 y | Age 5 to <7 y | Age 7 to <9 y | Age >9 y | |
|---|---|---|---|---|---|
| n = 23 | n = 22 | n = 27 | n = 17 | n = 11 | |
| Artifact on DXA | 14 (61%) | 14 (64%) | 18 (67%) | 10 (59%) | 4 (36%) |
| Location of artifact | |||||
| Bone | 2/14 (14%) | 1/14 (7%) | 2/18 (11%) | 0/10 (0%) | 0/4 (0%) |
| Soft tissue | 11/14 (79%) | 12/14 (86%) | 16/18 (89%) | 9/10 (90%) | 4/4 (100%) |
| Bone and soft tissue | 1/14 (7%) | 1/14 (7%) | 0/18 (0%) | 1/10 (10%) | 0/4 (0%) |
| BMD z score | −0.97 (−2.03 to −0.32) | −1.37 (−2.45 to 0.06) | −1.12 (−2.48 to 0.22) | −0.78 (−1.46 to −0.35) | −0.93 (−1.67 to 0.78) |
| [−4.25, 1.71] | [−4.83, 1.19] | [−4.08, 1.65] | [−3.31, 1.60] | [−3.70, 2.10] | |
| Low BMDa | 6 (26%) | 8 (36%) | 7 (26%) | 2 (12%) | 2 (18%) |
| HAZ‐adjusted BMD z score | −0.62 (−1.61 to 0.39) | −0.91 (−1.92 to 0.54) | −0.67 (−1.39 to 0.25) | −0.21 (−0.55 to 0.65) | 0.27 (−0.84 to 1.33) |
| [−3.52, 2.68] | [−4.27, 1.90] | [−2.52, 2.56] | [−2.32, 2.49] | [−2.84, 2.90] | |
| Low HAZ‐adjusted BMD z scorea | 3 (13%) | 5 (23%) | 1 (4%) | 1 (6%) | 1 (9%) |
Note: Data are presented as median (25th–75th percentiles), [minimum, maximum], or n (%).
Abbreviations: BMD, bone mineral density; DXA, dual‐energy x‐ray absorptiometry; HAZ, height‐for‐age z score.
a
Low BMD defined as a BMD z score ≤ −2.0.