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Table 1 Baseline characteristics according to the baseline pain phenotype membership

From: Phenotypes of osteoarthritis-related knee pain and their transition over time: data from the osteoarthritis initiative

Characteristics

No Pain

Mild P-A

Mild P-R-A

Mod P-R-A

Sex (female, %)

55.8

59.4

58.3

69.8

Age, years, mean (SD)

61.4 (9.2)

61.5 (9.1)

60.6 (9.2)

60.6 (8.7)

CES-D, mean (SD)

5.3 (6.0)

6.3 (6.1)

8.1 (7.7)

11.1 (9.1)

BMI, kg/m2, mean (SD)

27.7 (4.5)

28.6 (4.6)

29.7 (4.8)

31.5 (5.5)

Education (college of above, %)

88.4

87.1

79.2

65.5

Race (non-whites, %)

12.2

17.3

27.3

51.6

Injury (yes, %)

19.9

30.2

39.2

43.2

Baseline KL

 0

48.3

32.1

26.3

16.9

 1

20.1

17.3

15.5

8.5

 2

21.9

23.1

27.6

35.3

 3

9.1

15.0

21.6

27.8

 4

0.6

3.5

8.7

11.5

  1. Mild P-A mild pain during activity, Mild P-R-A mild pain during both rest and activity, Mod P-R-A moderate pain during both rest and activity, CES-D Center for Epidemiological Studies-Depression, BMI body mass index, KL Kellgren and Lawrence
  2. Quantitative variables are shown as mean (SD), and qualitative variables are shown as (%)