Table 5.

Dual energy X-ray absorptiometry bone parameters in men.

Age (yr)

40–44 (n = 25)

45–49 (n = 34)

50–54 (n = 29)

55–59 (n = 31)

60–64 (n = 27)

65–69 (n = 35)

70–74 (n = 30)

75+ (n = 28)

β-Coefficient (95% CI)

R2

Unadjusted p-value

β-Coefficient (95% CI)

R2

Adjusted p-value

Whole body

aBMD (g/cm2)

1.2 ± 0.1(n=24)

1.2 ± 0.1

1.2 ± 0.1

1.1 ± 0.1

1.1 ± 0.1

1.1 ± 0.1

1.1 ± 0.1(n=29)

1.1 ± 0.1(n=26)

−0.003 (−0.004, −0.002)

0.13

<0.0001

−0.002 (−0.003, −0.0008)

0.34

<0.0001

BMC (g)

2,804 ± 433(n=24)

2,632 ± 358

2,739 ± 433

2,532 ± 374

2,442 ± 448

2,433 ± 366

2,335 ± 299(n=29)

2,279 ± 380(n=26)

−13.3 (−17.4, −9.2)

0.15

<0.0001

−3.9 (−6.6, −1.1)

0.66

0.007

BA (cm2)

2,355 ± 200(n=24)

2,275 ± 212

2,321 ± 233

2,242 ± 217

2,210 ± 243

2,175 ± 215

2,171 ± 204(n=29)

2,087 ± 205(n=26)

−6.2 (−8.5, −3.9)

0.11

<0.0001

−0.1 (−1.2, 1.0)

0.83

0.856

Spine

aBMD (g/cm2)

1.1 ± 0.2(n=24)

1.0 ± 0.1

1.1 ± 0.1

1.0 ± 0.1(n=30)

1.0 ± 0.2

1.0 ± 0.2

1.0 ± 0.2

1.0 ± 0.2(n=26)

−0.002 (−0.004, −0.0004)

0.03

0.014

−0.0006 (−0.002, 0.001)

0.13

0.486

BMC (g)

61.1 ± 12.6(n=24)

57.1 ± 8.9

59.6 ± 11.0

54.5 ± 9.3(n=30)

55.9 ± 17.6

55.4 ± 11.3

54.2 ± 10.8

53.5 ± 13.5(n=26)

−0.1 (−0.3, −0.02)

0.02

0.025

0.06 (−0.05, 0.17)

0.31

0.306

BA (cm2)

55.7 ± 5.2(n=24)

55.7 ± 4.0

56.4 ± 5.8

54.8 ± 5.2(n=30)

55.9 ± 7.2

54.9 ± 4.8

55.6 ± 6.8

54.6 ± 5.6(n=26)

−0.02 (−0.08, 0.03)

0.003

0.405

0.09 (0.05, 0.13)

0.56

<0.0001

Total hip

aBMD (g/cm2)

1.1 ± 0.2

1.0 ± 0.1

1.1 ± 0.1

1.0 ± 0.1(n=29)

0.9 ± 0.2

1.0 ± 0.1(n=33)

0.9 ± 0.1(n=29)

0.9 ± 0.2(n=27)

−0.004 (−0.006, −0.003)

0.14

<0.0001

−0.003 (−0.005, −0.002)

0.20

<0.0001

BMC (g)

35.4 ± 6.2

34.2 ± 4.2

35.8 ± 4.5

33.0 ± 4.4(n=29)

31.4 ± 5.9

31.6 ± 4.7(n=33)

31.1 ± 4.4(n=29)

29.7 ± 6.3(n=27)

−0.15 (−0.2, −0.1)

0.12

<0.0001

−0.07 (−0.1, −0.02)

0.32

0.005

BA (cm2)

33.3 ± 2.1

33.5 ± 2.6

34.1 ± 2.3

33.4 ± 2.2(n=29)

33.8 ± 2.6

33.0 ± 2.1(n=33)

34.0 ± 2.0(n=29)

33. 0 ± 2.2(n=27)

−0.009 (−0.03, 0.02)

0.002

0.468

0.04 (0.02, 0.06)

0.52

<0.0001

Femoral neck

aBMD (g/cm2)

1.0 ± 0.1

1.0 ± 0.1

1.0 ± 0.1

0.9 ± 0.1(n=30)

0.9 ± 0.1

0.9 ± 0.1

0.8 ± 0.1(n=29)

0.8 ± 0.2(n=27)

−0.005 (−0.007, −0.004)

0.22

<0.0001

−0.004 (−0.006, −0.003)

0.31

<0.0001

BMC (g)

5.0 ± 1.0

4.7 ± 0.7

5.0 ± 0.7

4.4 ± 0.6(n=30)

4.3 ± 0.8

4.3 ± 0.7

4.0 ± 0.6(n=29)

3.8 ± 0.8(n=27)

−0.03 (−0.04, −0.02)

0.20

<0.0001

−0.02 (−0.03, −0.01)

0.36

<0.0001

BA (cm2)

4.8 ± 0.6

5.0 ± 0.6

5.1 ± 0.5

4.8 ± 0.5(n=30)

5.0 ± 0.5

5.0 ± 0.5

4.8 ± 0.4(n=29)

4.8 ± 0.6(n=27)

−0.003 (−0.009, 0.002)

0.01

0.264

0.002 (−0.003, 0.008)

0.13

0.382

Radius

aBMD (g/cm2)

0.7 ± 0.1

0.7 ± 0.1

0.7 ± 0.1

0.7 ± 0.1

0.7 ± 0.1

0.7 ± 0.1

0.6 ± 0.1

0.6 ± 0.1(n=27)

−0.004 (−0.005, −0.003)

0.25

<0.0001

−0.003 (−0.004, −0.002)

0.34

<0.0001

BMC (g)

12.9 ± 1.6

12.2 ± 1.7

12.5 ± 1.9

12.0 ± 1.8

11.4 ± 1.8

11.3 ± 2.1

10.6 ± 1.5

10.2 ± 2.0(n=27)

−0.07 (−0.09, −0.05)

0.17

<0.0001

−0.03 (−0.05, −0.02)

0.49

<0.0001

BA (cm2)

17.3 ± 1.6

17.1 ± 2.1

17.5 ± 2.1

17.4 ± 1.8

17.6 ± 2.0

17.3 ± 2.1

17.4 ± 2.0

16.8 ± 1.7(n=27)

−0.005 (−0.02, 0.02)

0.001

0.649

0.03 (0.01, 0.05)

0.41

0.001

Values are mean ± SD.

Bold indicates significance.

Adjustments were made for weight and height.

β-Coefficients are calculated with age as a continuous variable.

Superscript values indicate the group numbers.

aBMD, areal bone mineral density; BMC, bone mineral content; BA, bone area.