Table 1

Characteristics of study participants by bone mass density


Number
Mean (SD) Age (years)
Mean (SD) BMI (kg/m2)
Proportion Caucasian
Proportion Male

ALL PARTICIPANTS





All BMD
6046
48.9 (14.1)
25.7 (5.1)
86.9
46.6
BMD <95
1607
60.7 (9.9)
25.8 (5.0)
87.0
41.6
BMD 95–105
1363
50.3 (13.3)
25.9 (5.2)
89.4
51.1
BMD 105–115
1491
43.8 (12.5)
25.6 (5.1)
87.0
49.8
BMD >115
1585
40.5 (11.1)
25.5 (5.0)
84.4
44.8
p-value for BMD trend

0.0001
0.07
0.009
0.10
MALES





All BMD
2818
49.3 (14.1)
25.8 (4.2)
87.0

BMD <95
668
59.4 (10.8)
25.4 (4.4)
87.1

BMD 95–105
697
51.6 (13.4)
25.7 (4.1)
88.8

BMD 105–115
743
45.4 (13.0)
25.9 (4.3)
86.7

BMD >115
710
41.6 (12.3)
26.1 (4.1)
85.5

p-value for BMD trend

0.0001
0.001
0.21

FEMALES





All BMD
3228
48.5 (14.1)
25.6 (5.7)
86.7

BMD <95
939
61.5 (9.2)
26.1 (5.3)
86.9

BMD 95–105
666
48.8 (13.1)
26.0 (6.2)
90.1

BMD 105–115
748
42.3 (11.8)
25.4 (5.7)
87.3

BMD >115
875
39.7 (9.9)
25.1 (5.6)
83.5

p-value for BMD trend

0.0001
0.0001
0.02

FEMALES > 55 YEARS





All BMD
1162
64.0 (5.6)
26.9 (5.6)
86.4

BMD <80.3
288
66.5 (5.2)
25.8 (5.2)
88.9

BMD 80.3–89.7
289
64.8 (5.5)
26.7 (5.4)
85.8

BMD 89.7–99.9
291
63.3 (5.5)
27.1 (5.3)
88.7

BMD >99.9
294
61.7 (5.1)
28.2 (6.4)
87.3

p-value for BMD trend

0.0001
0.0001
0.06


BMI; Body Mass Index. BMD; Bone Mineral Density. Two males and 1 female had missing values for BMI. P-values for BMD trend from linear regression analysis with single indicator variable for BMD (age, BMI) and Mantel-Hansel Chi-square test for trend (race, gender).

Nelson et al. BMC Cancer 2002 2:22   doi:10.1186/1471-2407-2-22