Table 1

Demographic characteristics of rheumatoid arthritis patients and controls in the MyEIRA study population

Characteristic

Malay

Chinese

Indian

Others


RA (n = 516)

Controls (n = 986)

RA (n = 255)

Controls (n = 206)

RA (n = 379)

Controls (n = 285)

RA (n = 88)

Controls (n = 93)


Female

86.8

88.1

83.5

86.9

87.9

84.6

84.1

90.4

Age (years)

46 (11.8)

46 (11.4)

52 (11.2)

52 (11.3)

48 (11.6)

49 (10.6)

49 (12.1)

45 (11.7)

ACPA-positive

60.5

2.4

66.3

3.4

67.3

2.1

70.5

1.1

IgM RF-positive

47.5

3.8

49.4

3.4

55.9

5.3

62.5

6.4

IgG RF-positive

48.4

6.3

49.4

6.8

54.1

6.3

64.8

7.4

DRB1 SE-positivea

35.5

13.1

36.5

12.1

48.5

30.2

40.9

17.0


Data presented as percentage or mean (standard deviation). ACPA, anti-citrullinated protein antibody; MyEIRA, Malaysian Epidemiological Investigation of Rheumatoid Arthritis; RA, rheumatoid arthritis; RF, rheumatoid factor; SE, shared epitope. aPatients and controls carrying one or two alleles of a SE were classified as SE-positive.

Too et al. Arthritis Research & Therapy 2012 14:R250   doi:10.1186/ar4093

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