Characteristics of study participants at baseline
| RA patients (N=1121) | RA controls (N=4282) | IBD patients (N=1875) | IBD controls (N=7308) | |
|---|---|---|---|---|
| Females | 939 (77) | 3741 (77) | 943 (50%) | 3677 (50%) |
| Age at diagnosis—mean (SD) | 54 (15) | 54 (15) | 38 (19) | 38 (19) |
| Ethnicity | ||||
| White | 423 (35) | 1677 (35) | 780 (42) | 2458 (33) |
| Black | 165 (14) | 732 (15) | 181 (10) | 1046 (15) |
| Asian | 92 (8) | 285 (6) | 85 (4) | 392 (5) |
| Mixed | 233 (19) | 870 (18) | 446 (24) | 1299 (18) |
| Other | 158 (13) | 539 (11) | 99 (5) | 565 (8) |
| Missing | 146 (12) | 747 (15) | 286 (15) | 1548 (21) |
| IMD quintile | ||||
| Most | 461 (38) | 1694 (35) | 604 (32) | 2505 (34) |
| Second | 556 (46) | 2340 (48) | 93 6 (50) | 3446 (47) |
| Third | 150 (12) | 573 (12) | 233 (13) | 932 (13) |
| Fourth | 26 (2) | 132 (3) | 60 (3) | 212 (3) |
| Least | / | 5 (0) | / | 4 (0.1) |
| Missing | 24 (2) | 106 (2) | 42 (2) | 209 (3) |
| Chronic kidney disease | 39 (3) | 146 (3) | 28 (2) | 92 (1) |
| Diabetes | 134 (12) | 469 (11) | 125 (7) | 431 (6) |
| Antihypertensive drugs* | 74 (7) | 341 (8) | 60 (3) | 265 (4) |
| Lipid-lowering drugs† | 26 (2) | 88 (2) | 21 (1) | 57 (1) |
| Cardiovascular disease | 98 (9) | 362 (8) | 103 (5) | 326 (4) |
| Depression | 163 (15) | 651 (15) | 205 (11) | 860 (12) |
| Cancer | 48 (4) | 397 (9) | 54 (3) | 229 (3) |
Figures are frequencies and percentages, unless otherwise specified.
Percentages based on recorded data.
*Percentage of participants prescribed antihypertensive drugs in the year preceding disease diagnosis.
†Percentage of participants prescribed lipid-lowering drugs in the year preceding disease diagnosis.
IBD, inflammatory bowel disease; IMD, Index of multiple deprivation; RA, rheumatoid arthritis.