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Table 2 Prevalence of knee OA according to two different definitions

From: Associations between serum biomarkers of cartilage metabolism and serum hyaluronic acid, with risk factors, pain categories, and disease severity in knee osteoarthritis: a pilot study

Prevalence of knee OA based on a combination of KL grades

Combination of KL grades

Group, n

Total

Population a

Healthy

Early OA

Late OA

Total

Mild

Severe

0:0

38

38

–

–

–

76

1:0

–

4

–

–

–

4

1:1

–

2

–

–

–

2

2:0

–

–

–

–

–

0

2:1

–

–

1

1

–

1

2:2

–

–

34

34

–

34

3:0

–

–

0

–

–

0

3:1

–

–

10

–

10

10

3:2

–

–

10

–

10

10

3:3

–

–

63

–

63

63

4:0

–

–

0

–

0

0

4:1

–

–

3

–

3

3

4:2

–

–

1

–

1

1

4:3

–

–

4

–

4

4

4:4

–

–

4

–

4

4

Total

38

44

130

35

95

212

Prevalence of knee OA based on the mean of KL grades

Mean of KL grades

Group, n

Total

Population a

Healthy

Early OA

Late OA

Total

Mild

Severe

0.0

38

38

–

–

–

76

0.5

–

4

–

–

–

4

1.0

–

2

–

–

–

2

1.5

–

–

1

1

–

1

2.0

–

–

44

34

10

44

2.5

–

–

13

–

13

13

3.0

–

–

64

–

64

64

3.5

–

–

4

–

4

4

4.0

–

–

4

–

4

4

Total

38

44

130

35

95

212

  1. aTotal population = health individuals + patients with early OA + total number of patients with late OA