Table 1.
Basic characteristics among 12,362 participants according to knee chondrocalcinosis status
| Chondrocalcinosis status | P | ||
|---|---|---|---|
| Yes | No | ||
| Number | 153 | 12,209 | – |
| Median serum zinc level (μmol/L) | 12.4 | 13.1 | – |
| Median serum copper level (μmol/L) | 17.5 | 16.0 | – |
| Median Cu/Zn ratio | 1.45 | 1.21 | – |
| Age (years) | 61.7 ± 10.1 | 52.0 ± 7.8 | < 0.001 |
| 40–49 (%) | 15.0 | 45.2 | |
| 50–59 (%) | 27.5 | 37.7 | |
| 60–69 (%) | 35.3 | 14.5 | |
| ≥ 70 (%) | 22.2 | 2.6 | |
| Gender (% female) | 45.8 | 43.2 | 0.528 |
| BMI (kg/m2) | 24.9 ± 3.5 | 24.5 ± 4.0 | 0.161 |
| < 28 kg/m2 (%) | 83.0 | 87.0 | |
| ≥ 28 kg/m2 (%) | 17.0 | 13.0 | |
| Serum iron (μmol/l) | 16.7 ± 5.2 | 18.5 ± 6.5 | < 0.001 |
| Serum calcium (mmol/l) | 2.4 ± 0.1 | 2.4 ± 0.1 | 0.609 |
| Serum magnesium (mmol/l) | 0.88 ± 0.12 | 0.89 ± 0.08 | 0.023 |
| Serum phosphorus (mmol/l) | 1.1 ± 0.2 | 1.2 ± 0.2 | 0.840 |
BMI body mass index, Cu/Zn ratio the ratio of serum copper to zinc concentrations
Data are mean ± standard deviation, unless otherwise indicated