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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 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

  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