| Tertiles of serum copper (μmol/L) | P for trend | ||
---|---|---|---|---|
1 (≤ 14.7) | 2 (14.8–17.5) | 3 (≥ 17.6) | ||
Total | ||||
 Knee chondrocalcinosis (%) | 0.8 | 1.1 | 1.9 | – |
 N for knee* | 8390 | 8190 | 8141 | – |
 Model 1 (95% CI) | 1.00 (reference) | 1.26 (0.77, 2.05) | 2.01 (1.25, 3.24) | 0.003 |
 Model 2 (95% CI) | 1.00 (reference) | 1.26 (0.78, 2.06) | 1.94 (1.21, 3.12) | 0.004 |
 Model 3 (95% CI) | 1.00 (reference) | 1.24 (0.76, 2.02) | 2.00 (1.24, 3.23) | 0.003 |
 Model 4 (95% CI) | 1.00 (reference) | 1.27 (0.78, 2.07) | 2.11 (1.31, 3.38) | 0.001 |
 Model 5 (95% CI) | 1.00 (reference) | 1.22 (0.75, 1.99) | 1.95 (1.21, 3.12) | 0.004 |
Model 6 (95% CI) | 1.00 (reference) | 1.24 (0.76, 2.02) | 2.00 (1.24, 3.22) | 0.003 |