Relative risk of developing rheumatoid factor (RF) positive rheumatoid arthritis, RF negative rheumatoid arthritis, and rheumatoid arthritis overall for subjects who were not higher non-manual employees compared with higher non-manual employees, by sex
| Ca/Co | RR* | 95% CI | RR** | 95% CI | ||
|---|---|---|---|---|---|---|
| Women | ||||||
| RF+ RA | Not higher non-manual employees | 298/529 | 1.6 | 1.1 to 2.5 | 1.6 | 1.0 to 2.6 |
| Higher non-manual employees† | 35/99 | 1.0 | – | 1.0 | – | |
| RF− RA | Not higher non-manual employees | 155/529 | 0.8 | 0.5 to 1.2 | 0.9 | 0.5 to 1.5 |
| Higher non-manual employees† | 34/99 | 1.0 | – | 1.0 | – | |
| Total RA | Not higher non-manual employees | 453/529 | 1.2 | 0.8 to 1.6 | 1.3 | 0.9 to 1.9 |
| Higher non-manual employees† | 69/99 | 1.0 | – | 1.0 | – |
| Ca/Co | RR* | 95% CI | RR** | 95% CI | ||
|---|---|---|---|---|---|---|
| Men | ||||||
| RF+ RA | Not higher non-manual employees | 120/207 | 1.2 | 0.8 to 2.0 | 1.2 | 0.7 to 2.2 |
| Higher non-manual employees† | 34/73 | 1.0 | – | 1.0 | – | |
| RF− RA | Not higher non-manual employees | 53/207 | 1.0 | 0.6 to 1.9 | 0.9 | 0.5 to 1.8 |
| Higher non-manual employees† | 20/73 | 1.0 | – | 1.0 | – | |
| Total RA | Not higher non-manual employees | 173/207 | 1.2 | 0.8 to 1.8 | 1.1 | 0.7 to 1.8 |
| Higher non-manual employees† | 54/73 | 1.0 | – | 1.0 | – |
| Ca/Co | RR§ | 95% CI | RR§§ | 95% CI | ||
|---|---|---|---|---|---|---|
| Values are relative risks with 95% confidence intervals. | ||||||
| *RR adjusted for age and residential area. | ||||||
| **RR adjusted for age, residential area, and smoking. | ||||||
| §RR adjusted for age, residential area, and sex. | ||||||
| §§RR adjusted for age, residential area, sex, and smoking. | ||||||
| †Reference group. | ||||||
| Ca/Co, number of exposed cases/number of exposed controls; CI, confidence interval; RF, rheumatoid factor; RR, relative risk. | ||||||
| All | ||||||
| RF+ RA | Not higher non-manual employees | 418/736 | 1.4 | 1.0 to 2.0 | 1.5 | 1.0 to 2.1 |
| Higher non-manual employees† | 69/172 | 1.0 | – | 1.0 | – | |
| RF− RA | Not higher non-manual employees | 208/736 | 0.8 | 0.6 to 1.2 | 0.9 | 0.6 to 1.3 |
| Higher non-manual employees† | 54/172 | 1.0 | – | 1.0 | – | |
| Total RA | Not higher non-manual employees | 626/736 | 1.2 | 0.9 to 1.5 | 1.2 | 0.9 to 1.6 |
| Higher non-manual employees† | 123/172 | 1.0 | – | 1.0 | – | |