Main diagnostic groups | Subgroups of injury | Duration, range (median) | n (% women) | Age in years, median (range) | Differences in age, p value |
---|---|---|---|---|---|
Reference subjects | – | NA | 23 (22) | 26 (15–58) | – |
Osteoarthritisa | – | 0–14.8 years (2.7) | 24 (42) | 64 (36–86) | <0.001 |
Rheumatoid arthritisb | – | 0–43.0 years (10) | 32 (63) | 64 (32–83) | <0.001 |
Pyrophosphate arthritis | – | 0–9.8 years (0.01) | 25 (40) | 75 (41–92) | <0.001 |
Knee injuryc | – | 0–36.9 years (0.02) | 294 (27) | 29 (13–65) | 0.842 |
Recent injury | 0–83 days (4) | 219 (25) | 26 (13–64) | 0.705 | |
Recent injury, substratification | 0 days (0) | 35 (23) | 30 (14–47) | 0.991 | |
1 day (1) | 39 (21) | 24 (13–57) | 0.211 | ||
2–3 days (3) | 31 (29) | 26 (16–54) | 0.914 | ||
4–7 days (5) | 46 (28) | 25 (14–64) | 0.492 | ||
8–22 days (11) | 44 (30) | 23 (14–57) | 0.151 | ||
23–83 days (32) | 24 (13) | 38 (21–59) | 0.033 | ||
Old injuryd | 1–36.9 years (3.3) | 75 (33) | 32 (18–65) | 0.090 | |
Old injury, substratification | 1–3 years (2.0) | 35 (40) | 33 (18–61) | 0.149 | |
3.01–36.9 years (5.1) | 40 (28) | 30 (18–65) | 0.121 |