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Table 1 Basic characteristics among 12,362 participants according to knee chondrocalcinosis status

From: Association between serum zinc and copper concentrations and copper/zinc ratio with the prevalence of knee chondrocalcinosis: a cross-sectional study

 Chondrocalcinosis statusP
YesNo
Number15312,209
Median serum zinc level (μmol/L)12.413.1
Median serum copper level (μmol/L)17.516.0
Median Cu/Zn ratio1.451.21
Age (years)61.7 ± 10.152.0 ± 7.8< 0.001
 40–49 (%)15.045.2 
 50–59 (%)27.537.7 
 60–69 (%)35.314.5 
  ≥ 70 (%)22.22.6 
Gender (% female)45.843.20.528
BMI (kg/m2)24.9 ± 3.524.5 ± 4.00.161
  <  28 kg/m2 (%)83.087.0 
  ≥ 28 kg/m2 (%)17.013.0 
Serum iron (μmol/l)16.7 ± 5.218.5 ± 6.5< 0.001
Serum calcium (mmol/l)2.4 ± 0.12.4 ± 0.10.609
Serum magnesium (mmol/l)0.88 ± 0.120.89 ± 0.080.023
Serum phosphorus (mmol/l)1.1 ± 0.21.2 ± 0.20.840
  1. BMI body mass index, Cu/Zn ratio the ratio of serum copper to zinc concentrations
  2. Data are mean ± standard deviation, unless otherwise indicated