Table 2

Prevalence of reduced BMD measured by dual-energy x-ray absorptiometry at different skeletal sites.

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 (%)


Women

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

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

≥ 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)


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.

Klingberg et al. Arthritis Research & Therapy 2012 14:R108   doi:10.1186/ar3833

Open Data