Table 2 |
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Prevalence of reduced BMD measured by dual-energy x-ray absorptiometry at different skeletal sites. |
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|
Measurement site |
Age-group, years |
BMD, mean ± SD |
T-score, mean ± SD |
Z-score, mean ± SD |
Patients with osteoporosis/BMD below expected range for age, number (%)a |
Patients with osteopenia, number (%) |
Patients with normal BMD number (%) |
|
|
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|
Women |
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|
AP lumbar spine |
< 50 |
1.014 ± 0.134 |
-0.30 ± 1.22 |
0.02 ± 1.25 |
2 (5) |
0 (0) |
41 (95) |
|
≥ 50 |
0.899 ± 0.150 |
-1.35 ± 1.37 |
0.14 ± 1.38 |
12 (27) |
15 (34) |
17 (39) |
|
|
Lat lumbar spine |
< 50 |
0.741 ± 0.102 |
-0.94 ± 1.22 |
-0.25 ± 1.26 |
3 (7) |
0 (0) |
40 (93) |
|
≥ 50 |
0.616 ± 0.114 |
-2.43 ± 1.36 |
-0.05 ± 1.42 |
20 (45) |
15 (34) |
9 (20) |
|
|
Total hip |
< 50 |
0.925 ± 0.122 |
-0.13 ± 1.00 |
0.07 ± 0.99 |
0 (0) |
0 (0) |
43 (100) |
|
≥ 50 |
0.832 ± 0.108 |
-0.89 ± 0.88 |
0.10 ± 0.85 |
0 (0) |
20 (46) |
23 (54) |
|
|
Femoral neck |
< 50 |
0.804 ± 0.127 |
-0.41 ± 1.15 |
-0.06 ± 1.13 |
0(0) |
0 (0) |
43 (100) |
|
≥ 50 |
0.702 ± 0.103 |
-1.32 ± 0.93 |
-0.01 ± 0.91 |
4 (9) |
24 (56) |
15 (35) |
|
|
Total radius |
< 50 |
0.576 ± 0.038 |
-0.05 ± 0.70 |
0.32 ± 0.74 |
0(0) |
0 (0) |
43 (100) |
|
≥ 50 |
0.517 ± 0.065 |
-1.14 ± 1.21 |
0.18 ± 1.09 |
7 (16) |
17 (39) |
20 (45) |
|
|
Men |
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|
AP lumbar spine |
< 50 |
1.057 ± 0.154 |
-0.31 ± 1.41 |
-0.18 ± 1.41 |
3 (5) |
0 (0) |
57 (95) |
|
≥ 50 |
1.092 ± 0.184 |
0.18 ± 1.67 |
0.63 ± 1.72 |
4 (7) |
8 (14) |
44 (79) |
|
|
Lat lumbar spine |
< 50 |
0.782 ± 0.131 |
NA |
NA |
NA |
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|
≥ 50 |
0.740 ± 0.132 |
NA |
NA |
NA |
|||
|
Total hip |
< 50 |
0.999 ± 0.137 |
-0.23 ± 0.92 |
-0.05 ± 0.90 |
1 (2) |
0 (0) |
59 (98) |
|
≥ 50 |
0.963 ± 0.136 |
-0.46 ± 0.90 |
0.00 ± 0.93 |
0 (0) |
19 (33) |
38 (67) |
|
|
Femoral neck |
< 50 |
0.842 ± 0.130 |
-0.67 ± 0.95 |
-0.21 ± 0.93 |
1 (2) |
0 (0) |
59 (98) |
|
≥ 50 |
0.773 ± 0.122 |
-1.16 ± 0.90 |
-0.21 ± 0.90 |
5 (9) |
25 (44) |
27 (47) |
|
|
Total radius |
< 50 |
0.668 ± 0.050 |
-0.34 ± 0.93 |
-0.12 ± 0.91 |
1 (2) |
0 (0) |
59 (98) |
|
≥ 50 |
0.633 ± 0.063 |
-1.03 ± 1.21 |
-0.25 ± 1.20 |
9 (16) |
18 (33) |
28 (51) |
|
|
|
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|
Definition of reduced BMD in patients younger than 50 years, BMD below expected range for age (Z-score ≤ -2.0 SD), BMD within expected range for age (Z-score > -2.0 SD); in patients 50 years or older, World Health Organization definition of osteoporosis: T-score ≤ - 2.5 SD, osteopenia: T-score < -1 to > -2.5 SD; normal BMD, T-score ≥ -1SD. For lateral lumbar spine BMD in men there are no reference values available for calculation of T- or Z-scores. aData presented as the sum of patients younger than 50 years, with a Z-score ≤ -2.0 SD and patients 50 years or older with a T-score ≤ -2.5 SD. AP, anteroposterior; Lat, lateral; BMD, bone mineral density. |
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|
Klingberg et al. Arthritis Research & Therapy 2012 14:R108 doi:10.1186/ar3833 |
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