Table 6

Conditional logistic regression model for men: most parsimonious model

Item

ntot

Cases (n)

Controls (n)

P value

Odds ratio

95% confidence interval


Knee OA in relatives

No (R)

367

170

197

1.00

-

Yes

109

76

33

<0.01

2.37

1.41 to 3.98

Body mass index

18.5 to <25 kg/m2 (R)

157

48

109

1.00

-

≥25 to <30 kg/m2

240

133

107

<0.001

2.26

1.43 to 3.57

≥30 to <35 kg/m2

128

84

44

<0.001

4.00

2.30 to 6.94

≥35 kg/m2

40

35

5

<0.001

12.56

4.40 to 36.86

Occupation: kneeling or squatting

No (R)

272

128

144

1.00

-

Yes, <3,574 hours/life

94

48

46

NS

1.70

0.96 to 3.00

Yes, 3,574 to 12,244 hours/life

94

55

39

<0.01

2.16

1.24 to 3.77

Yes, >12,244 hours/life

94

61

33

<0.01

2.47

1.41 to 4.32

Sports with risk for unapparent trauma

No (R)

218

109

109

1.00

-

Yes, <3,232 hours/life

168

82

86

NS

1.57

0.98 to 2.52

Yes, ≥3,232 hours/life

168

104

64

<0.01

2.58

1.59 to 4.17


NS, not significant; (R), reference category.

Klussmann et al. Arthritis Research & Therapy 2010 12:R88   doi:10.1186/ar3015

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