Seropositive RA | Seronegative RA | Controls | |||||||
Observed | Imputed | All | Observed | Imputed | All | Observed | Imputed | All | |
Complete data | n=7887 | n=0 | n=3398 | n=0 | n=115 249 | n=0 | |||
Age (median) | 59 | – | 62 | – | 60 | – | |||
Women (%) | 70 | – | 63 | – | 68 | – | |||
Exposed to asbestos (%) | 5 | – | 6 | – | 4 | – | |||
Exposed to silica (%) | 7 | – | 7 | – | 5 | – | |||
Incomplete data | |||||||||
Education | n=7876 | n=11 | n=7887 | n=3391 | n=7 | n=3398 | n=114 992 | n=257 | n=115 249 |
≤9 years (%) | 31 | 55 | 31 | 30 | 36 | 30 | 27 | 36 | 27 |
10–12 years (%) | 46 | 33 | 46 | 45 | 44 | 45 | 45 | 43 | 45 |
>12 years (%) | 24 | 11 | 24 | 24 | 21 | 24 | 28 | 21 | 28 |
Smoking | n=2026 | n=5861 | n=7887 | n=659 | n=2739 | n=3398 | n=4356 | n=110 893 | n=115 249 |
Ever smoking (%) | 72 | 70 | 70 | 57 | 57 | 57 | 55 | 57 | 56 |
Pack-years (median) | 18 | 19 | 19 | 15 | 14 | 14 | 13 | 14 | 14 |
Alcohol consumption | n=2168 | n=5719 | n=7887 | n=716 | n=2682 | n= 398 | n=4700 | n=110 549 | n=115 249 |
Non-drinkers (%) | 10 | 7 | 8 | 9 | 7 | 8 | 6 | 7 | 7 |
Low consumption (%) | 54 | 54 | 54 | 51 | 51 | 51 | 47 | 46 | 46 |
Moderate consumption (%) | 21 | 22 | 22 | 23 | 23 | 23 | 24 | 24 | 24 |
High consumption (%) | 15 | 17 | 17 | 17 | 19 | 18 | 23 | 22 | 22 |
RA, rheumatoid arthritis;.