Distribution of the frequency of selected rheumatic diseases in the Spanish population by age
| Disease | Age bands | ||||||
|---|---|---|---|---|---|---|---|
| 20–29 | 30–39 | 40–49 | 50–59 | 60–69 | 70–79 | ⩾80 | |
| Rheumatoid arthritis | 1 (0.2) | 1 (0.2) | 2 (0.5) | 1 (0.3) | 3 (1.0) | 1 (0.5) | 1 (2.7) |
| Low back pain | 29 (8.9) | 53 (16.3) | 57 (17.5) | 64 (19.7) | 69 (21.2) | 40 (12.3) | 13 (4.0) |
| Knee osteoarthritis | 2 (0.4) | 3 (0.7) | 13 (3.5) | 32 (9.8) | 88 (28.1) | 69 (33.7) | 16 (21.3) |
| Hand osteoarthritis | — | — | 4 (1.1) | 22 (6.7) | 48 (15.3) | 49 (23.9) | 13 (17.3) |
| Fibromyalgia | — | 7 (1.6) | 18 (4.9) | 12 (3.7) | 9 (2.9) | 6 (2.9) | — |