Table 1

Characteristics of the study population

Total (n = 126)

Men (n = 58)

Women (n = 68)

Pa


Age, years

63.6 ± 10.1

64.2 ± 10.0

63.2 ± 10.3

0.58

Height, cm

167.7 ± 9.1

174.6 ± 6.8

161.8 ± 6.1

<0.001

Weight, kg

81.4 ± 15.5

85.1 ± 14.9

78.3 ± 15.3

0.01

BMI, kg/m2

28.9 ± 5.1

27.8 ± 3.8

29.9 ± 5.8

0.02

WOMAC score

436 ± 224

411 ± 214

457 ± 232

0.25

SF-36 score

98 ± 7

98 ± 6

99 ± 8

0.25

Physical activity

6.2 ± 1.8

6.7 ± 1.7

5.8 ± 1.8

0.01

Time between scans, years

1.95 ± 0.21

1.94 ± 0.19

1.96 ± 0.23

0.58

OA gradeb

Grade of medial osteophytes

<2

107

50

57

0.50

≥ 2

18

7

11

0.35

Grade of medial JSN

<2

90

35

55

0.04

≥ 2

35

22

13

0.13

Grade of lateral osteophytes

<2

103

48

55

0.49

≥ 2

22

9

13

0.39

Grade of lateral JSN

<2

116

55

61

0.58

≥ 2

9

2

7

0.10

Tibial plateau area, mm2

Medial

2054.6 ± 363.9

2331.1 ± 304.3

1860.2 ± 263.2

<0.001

Lateral

1407.2 ± 256.7

1533.4 ± 244.9

1328.2 ± 232.8

<0.001


Except where indicated otherwise, values are means ± standard deviations. aMen vs women, by independent t-tests or chi-square test, as appropriate. bValues are the number of subjects in each grade category. One radiograph was lost after the study commenced. BMI, body mass index; JSN, joint-space narrowing.; MRI, magnetic resonance imaging; OA, osteoarthritis; SF-36, 36-Item Short-Form Health Survey; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.

Wang et al. Arthritis Research & Therapy 2005 7:R687-R693   doi:10.1186/ar1726

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