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Table 1 Characteristics of study participants by bone mass density

From: Bone mineral density and the subsequent risk of cancer in the NHANES I follow-up cohort

 

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

 
  1. 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).