Table 1 Characteristics of the respondents (n = 830)

Number (%)

830

478 (57.6%)

61 (7.3%)

114 (13.7%)

177 (21.3%)

Male (%)

295 (35.5%)

182 (38.1%)

24 (39.3%)

38 (33.3%)

51 (28.8%)

Age (range)

49 (20-70)

47 (20-65)^3,4***

46 (23-63)^{3**, 4***}

51(25-64)^{1***, 2**}

52 (24-70)^1,2***

EQ-5D (European) (range -0.074-1)

0.743 (0.05-1.00)

0.794 (0.21-1.00)^2,3,4***

0.685 (0.05-1.00)^1***,3*

0.600 (0.05-1.00)^1,4***,2*

0.717 (0.05-1.00)^1,3***

VAS EQ-5D (range 0 -100)

63.64 (0-100)

69.16 (0-100)^2,3,4***

56.34 (2-100)^1***

49.93 (7-95)^1,4***

60.05 (0-98)^1,4***

Pain (range 0 -100)

43.30 (0-100)

39.07 (0-100)^2,4*,3***

48.57 (0-95)^1*

55.18 (2-100)^1***,4*

45.23 (0-100)^1,3*

Disease duration (range)

12.61 (0-56)

11.73 (0-55)^3**,4*

10.67 (1-36)^3*

15.25 (1-52)^1**,2*

13.95 (1-56)^1*

Seriously restricted (%)

155 (18.7%)

44 (9.2%)^2,3***,4**

25 (41%)^1,4***

51 (44.7%)^1,4***

35 (19.8%)^1**,2,3***

Somewhat restricted (%)

530 (63.9%)

320 (66.9%)^3*

34 (55.7%)

60 (52.6%)^1*

116 (65.5%)

Country of residence

the Netherlands (%)

230 (27.7%)

156 (32.6%)

17 (27.9%)

32 (28.1%)

25 (14.1%)

United Kingdom (%)

200 (24.1%)

105 (22%)

111 (18%)

36 (31.6%)

48 (27.1%)

France (%)

200 (24.1%)

114 (23.8%)

15 (24.6%)

23 (20.2%)

48 (27.1%)

Germany (%)

200 (24.1%)

103 (21.5%)

18 (29.5%)

23 (20.2%)

56 (31.6%)

Not working due to RD (%)

160 (9.3%)

NA

NA

103 (90.4%)

57 (32.2%)

Having been absent in the last 3 months (%)

167 (20.1%)

106 (22.2%)^2***

61 (100%)^1***

NA

NA

Number of days absent (range 0-92)

18.89 (0-92)

8.58 (0-92)^2***

36.80 (1-91)^1***

NA

NA

Presenteeism – quantity (range 0-10)

8.60 (0-10)

8.81 (0-10)^2***

7.02 (0-10)^1***

NA

NA

Presenteeism – quality (range 0-10)

8.83 (0-10)

8.94 (0-10)^2***

8.03 (0-10)^1***

NA

NA

Overall presenteeism – quantity * quality (range 0-100)

78.80 (0-100)

80.91 (0-100)^2***

62.30 (0-100)^1***

NA

NA