Table 1 Participant characteristic table

Gender (male)

43.3%

Age (mean years(s.d.))

69.56 (9.84)

Marital status (married)

72%

Ethnicity (white)

99.1%

Paid employment (yes)

33.7%

Social Class

 I

5.7%

 II

33.8%

 IIINM

19.0%

 III M

23.4%

 IV

14.7%

 V

3.4%

Townsend quintiles (lower = most affluent)

 20%

−2.76

 40%

−1.89

 60%

−0.80

 80%

1.46

Mood (mod or severe/none)

30%/70%

BMI (mean(s.d.))

29.21 (5.30)

Affected joints

 Hip OA (n)

487

 Knee OA (n)

612

 Both Hip and Knee OA (n)

336

 Hip OA only (n)

151

 Knee OA only (n)

276

 No of affected joints (mean(s.d.))

2.64 (1.01)

WOMAC physical (mean(s.d.))

20.03 (14.51)

WOMAC pain for Hip OA (mean(s.d.))

3.70(4.16)

WOMAC pain for Knee OA (mean(s.d.))

5.83 (4.34)

WOMAC stiffness Hip OA (mean(s.d.))

1.70 (1.82)

WOMAC stiffness Knee OA (mean(s.d.))

2.53 (1.92)