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Table 2 Study characteristics of the included studies (n = 30)

From: Prognostic factors for progression of clinical osteoarthritis of the knee: a systematic review of observational studies

Author [ref.] year

Follow-up months

Definition of OA for inclusion

Age, years

Women, %

No. of patients

Quality score

A

B

C

D

E

F

G

H

I

J

K

L

M

Amin [10] 2009

30

ACR criteria

69

42

265

13

1

1

1

1

1

1

1

1

1

1

1

1

1

Tanamas [35] 2010

24

K/L

63.2 ± 10.3

51

109

13

1

1

1

1

1

1

1

1

1

1

1

1

1

Cicuttini [14] 2004

24

K/L

63.1 ± 10.3

58

113

12

1

1

1

1

1

1

0

1

1

1

1

1

1

Hill [19] 2007

30

ACR criteria

66.7 ± 9.2

41

233

12

1

1

1

1

1

1

0

1

1

1

1

1

1

Holla [21] 2014

60

ACR criteria

56.0 ± 5.1

81.3

697

12

1

1

1

1

1

1

1

0

1

1

1

1

1

Tanamas [36] 2010

24

ACR criteria

63.2 ± 10.3

70

109

12

1

1

1

1

1

1

1

0

1

1

1

1

1

Berry [12] 2010

24

ACR criteria

63.7 ± 10.3

58

117

11

1

1

1

1

1

1

1

0

1

0

1

1

1

Henriksen [18] 2013

12

K/L

63

82

157

11

1

0

1

1

1

1

1

1

1

0

1

1

1

Yang [38] 2015

36

K/L

43 % >65

58

1,625

11

1

0

1

1

1

1

0

1

1

1

1

1

1

Alschuler [9] 2013

12

K/L

65.3 ± 9.0

59

797

10

1

1

1

1

1

0

0

0

1

1

1

1

1

Amin [11] 2008

30

ACR criteria

67 ± 9

43

265

10

1

1

1

1

1

1

1

0

1

0

1

1

1

Collins [15] 2014

72

K/L

62 ± 9

59

1,753

10

1

0

1

1

1

0

0

1

1

1

1

1

1

Holla [20] 2010

24

ACR criteria

56.0 ± 5.1

80

832

10

1

1

1

1

1

1

1

0

1

0

1

1

1

Lapane [22] 2015

48

K/L

70

58

1,846

10

1

0

1

1

1

0

0

1

1

1

1

1

1

Larsson [23] 2012

90

OARSI

50 (32–73)

18

74

10

1

1

1

1

1

1

0

0

1

1

1

1

1

Laslett [24] 2014

60

K/L

61

100

323

10

1

1

1

1

1

0

0

1

1

0

1

1

1

Muraki [25] 2012

40

K/L

68.7 ± 11.3

75

1,313

10

1

1

1

1

1

1

0

0

1

1

1

1

1

Podsiadlo [28] 2014

72

ACR criteria

63.9

57

114

10

1

0

1

1

1

1

1

0

1

0

1

1

1

Riddle [30] 2012

48

OARSI

62

58

4,670

10

1

1

1

1

1

1

1

0

1

0

1

1

1

Roemer [32] 2014

60

K/L

64.2 ± 8.4

58

398

10

1

1

1

1

1

0

0

1

1

1

1

1

0

Bruyere [13] 2005

45.6

ACR criteria

64.7 ± 7.0

70

139

9

1

0

1

1

1

1

1

0

1

0

1

1

0

Conaghan [16] 2010

36

K/L

67 ± 10

73

531

9

1

1

1

1

1

1

0

0

1

0

1

1

0

Sharma [34] 2003

36

K/L

68.6 ± 10.8

73

236

9

1

1

1

1

1

1

0

0

1

0

1

1

0

Eckstein [17] 2013

48

K/L

58

64

97

8

1

0

1

1

1

0

1

0

1

1

1

0

0

Oak [26] 2013

48

K/L

61.2 ± 9.1

53

942

8

1

0

1

1

1

0

0

0

1

0

1

1

1

Riddle [29] 2009

24

K/L

61.6 ± 9.3

60

778

8

1

1

1

1

1

0

0

0

1

0

1

1

0

Scher [33] 2008

36

K/L

51

63

73

8

1

0

0

1

1

1

0

0

1

1

1

1

0

van Dijk [37] 2011

36

ACR criteria

65.9 ± 8.3

74

174

8

1

0

1

1

1

1

0

0

1

0

1

1

0

Pisters [27] 2012

60

ACR criteria

66.1 ± 8.5

74

216

7

1

0

1

1

1

0

0

0

1

0

1

1

0

Riddle [31] 2013

33

K/L

62.7 ± 8.6

63

1,410

7

1

0

1

1

1

0

0

0

1

0

1

1

0

  1. A–M represent criteria scores (see Table 1). ACR American College of Rheumatology, K/L Kellgren and Lawrence score, OA, osteoarthritis, OARSI Osteoarthritis Research Society International Atla