Table 1

Characteristics of the twins

n

Mean

SD


Age (y)

1096

58.9

5.8

BMI (kg/m2)

1096

25.6

4.0

Hip Kellgren-Lawrence score

654

0.63

1.5

Knee Kellgren-Lawrence score

912

1.00

1.7

Hand Kellgren-Lawrence score

1082

5.63

7.6


n

%


Hip Kellgren-Lawrence score

0,1

562

85.9

2+

92

14.1

Knee Kellgren-Lawrence score

0,1

671

72.2

2+

259

27.8

Hand Kellgren-Lawrence score

0,1

456

42.0

2+

630

58.0

Zygosity

Monozygous

454

41.4

Dizygous

642

58.6

Physical activity

Inactive

365

33.3

Moderately active

532

48.5

Active

199

18.2

Number of food frequency

1

351

32.0

questionnaires used

2

485

44.3

3

236

21.5

4

24

2.2


BMI represents body mass index, n sample size, SD standard deviation

Williams et al. BMC Musculoskeletal Disorders 2010 11:280   doi:10.1186/1471-2474-11-280

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