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Table 2 Metals and metalloids in urine and serum in two consecutive investigations

From: Metals and kidney markers in adult offspring of endemic nephropathy patients and controls: a two-year follow-up study

  Variable N Median 5%-value 95%-value Spearman correlation coefficient (p) ICC ICC 5%-value
As in urine (μg/L) 2003/04 201 3.10 0.70 9.30 0.28 (0.0001) -0.06 -0.18
  2004/05 189 2.90 0.80 8.90    
Cd in urine (μg/L) 2003/04 201 0.60 0.15 2.15 0.48 (< 0.0001) 0.44 0.34
  2004/05 189 0.70 0.27 1.91    
Creatinine in morning urine (g/L) 2003/04 201 0.72 0.15 1.80 -0.06 (0.40) -0.47 -0.56
  2004/05 189 0.75 0.10 1.95    
Pb in blood (μg/L) 2003/04 201 90.90 47.10 213.00 0.70 (< 0.0001) 0.69 0.62
  2004/05 189 85.00 39.10 203.00    
Se in serum (μg/L) 2003/04 201 56.90 36.00 78.50 0.45 (< 0.0001) 0.17 0.05
  2004/05 189 72.10 46.40 95.70    
  1. The intraclass correlation coefficient (ICC) is the between- subject minus the within- subject variance as a ratio to the sum of the two variances. A positive value of, for instance, 0.60 indicates that 60% of the variation is due to between-subject and 40% due to within-subject variance. ICC can become negative when the within-subject variance exceeds the between-subject variance.