Table 1 Demographic characteristics of patients with rheumatoid arthritis and controls in MyEIRA case-control study
Characteristics | All | Ethnicity | ||||||
|---|---|---|---|---|---|---|---|---|
Malay | Chinese | Indian | ||||||
RA cases* (n = 1229) | Controls* (n = 1566) | RA cases* (n = 514) | Controls* (n = 981) | RA cases* (n = 252) | Controls* (n = 204) | RA cases* (n = 404) | Controls* (n = 294) | |
Mean age (years old, SD) | 48.11 ± 11.61 | 47.22 ± 11.37 | 46.18 ± 11.77 | 46.36 ± 11.40 | 52.27 ± 11.21 | 50.96 ± 11.31 | 47.92 ± 10.81 | 48.24 ± 10.58 |
Female (%) | 85.8 | 85 | 86.2 | 85.7 | 80.9 | 82.8 | 87.3 | 82.3 |
ACPA positivity (%) | 64.4 | 2.4 | 60.5 | 2.4 | 66.2 | 3.4 | 67.1 | 2.1 |
HLA-DRB1 SE positivity (%) | 40.1 | 16.2 | 35.6 | 12.9 | 36.5 | 12.3 | 48.3 | 29.9 |