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Table 1 Basic characteristics of the population in the Xiangya Hospital Health Management Center Study (n = 12,631)

From: Dose-response relationship between lower serum magnesium level and higher prevalence of knee chondrocalcinosis

  Tertiles of serum Mg (mmol/L)
1 (≤0.86) 2 (0.87–0.91) 3 (≥0.92)
Number 4633 3720 4278
Median Mg level (mmol/L) 0.83 0.89 0.95
Sex (female, %) 45.3 42.5 40.9
Age (years) 52.1 ± 8.1 52.4 ± 8.1 52.5 ± 7.9
 40–49 (%) 43.5 41.1 39.5
 50–59 (%) 37.5 39.5 40.4
 60–69 (%) 15.2 15.9 17.2
 ≥70 (%) 3.8 3.5 2.9
BMI (kg/m2) 24.5 ± 3.4 24.4 ± 3.3 24.4 ± 3.2
 <25 (%) 57.6 59.2 58.6
 ≥25 (%) 42.4 40.8 41.4
Serum iron (μmol/L) 18.1 ± 6.5 18.4 ± 6.3 18.9 ± 6.5
Serum ferritin (μg/L) 78.4 ± 67.3 78.3 ± 68.2 81.5 ± 62.8
Serum calcium (mmol/L) 2.4 ± 0.1 2.4 ± 0.1 2.4 ± 0.1
Serum zinc (μmol/L) 13.1 ± 2.5 13.5 ± 2.6 13.7 ± 3.1
Serum copper (μmol/L) 16.1 ± 3.6 16.2 ± 3.4 16.8 ± 3.8
Serum phosphorus (mmol/L) 1.2 ± 0.2 1.2 ± 0.2 1.2 ± 0.2
Education (high school or above, %) 42.3 49.8 49.0
Occupation (manual labor, %) 20.1 17.2 17.5
  1. Mg magnesium, BMI body mass index