Table 1: Prevalence of MRI-detected cartilage lesions in the medial tibiofemoral posterior area of the knee among 92 male danish floor layers and 49 male danish graphic designers.

 

Lesions of the medial posterior area

Either knee

Left knee

Right knee

Occupation

Total

Occupation

Total

Occupation

Total

Floor layers

Graphic designers

Fisher’s exact

Floor layers

Graphic designers

Fisher’s exact1

 

Floor layers

Graphic designers

Fisher’s exact1

N

%

N

%

P

N

%

N

%

N

%

P

 

 

N

%

N

%

P

N

%

Max lesion score in the area

 

 

 

 

0.98

 

 

 

 

 

 

0.50

 

 

 

 

 

 

0.94

 

 

0

81

88.0

43

87.8

 

124

87.9

82

89.1

45

91.8

 

127

90.1

84

91.3

43

87.8

 

127

90.1

4

3

3.3

2

4.1

 

5

3.5

4

4.3

1

2.0

 

5

3.5

2

2.2

2

4.1

 

4

2.8

5

3

3.3

2

4.1

 

5

3.5

1

1.1

2

4.1

 

3

2.1

2

2.2

1

2.0

 

3

2.1

6

1

1.1

1

2.0

 

2

1.4

1

1.1

1

2.0

 

2

1.4

1

1.1

1

2.0

 

2

1.4

7

4

4.3

1

2.0

 

5

3.5

3

3.3

 

 

 

3

2.1

3

3.3

1

2.0

 

4

2.8

Missing

 

 

 

 

 

 

 

1

1.1

 

 

 

1

0.7

 

 

1

2.0

 

1

0.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max score ≥ 3

 

 

 

 

1.00

 

 

 

 

 

 

1.00

 

 

 

 

 

 

0.76

 

 

Yes

11

12.0

6

12.2

 

17

12.1

9

9.8

4

8.2

 

13

9.2

8

8.7

5

10.2

 

13

9.2

No

81

88.0

43

87.8

 

124

87.9

82

89.1

45

91.8

 

127

90.1

84

91.3

43

87.8

 

127

90.1

Missing

 

 

 

 

 

 

 

1

1.1

 

 

 

1

0.7

 

 

1

2.0

 

1

0.7

Total

92

100

49

100

 

141

100

92

100

49

100

 

141

100

92

100

49

100

 

141

100

 

1Fisher’s exact test of the association between occupation and severe cartilage lesions among observations with non-missing cartilage lesions.