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Table 3 Timeline of B-Pb, Hb and ZZP in the group of lead exposed children during 60 months of follow-up.

From: Follow-up study on lead exposure in children living in a smelter community in northern Mexico

  Time (months)
Variable 0 6 12 60
B-Pb concentration (μg/dl) Median (range) 10.12
(1.9-43.8)
8.75
(1.85-41.45)
8.3
(2.4-35.8)
4.4
(1.3 - 30.3)
B-Pb ≥ 10 μg/dl (%) 50.84 39.46 37.42 5.6
Hemoglobin (g/dl)b 13.4
(10.0-16.5)
13.6
(10.2-16.6)
13.5
(11.2 - 15.9)
13.9
(10.7-15.9)
ZPP b (μmol ZP/mole Heme) 63.0
(10.0-224.0)
62.0
(25-197)
57
(34-180)
65
(16-248)
Hb < 12.4 g/dl (%) 10.02 7.32 7.23 4.32
Hb < 12.4 g/dl Risk ratio (95% IC)ŧ 2.41*
(1.26 - 4.63)
1.76
(0.89 - 3.48)
1.74
(0.87 - 3.46)
1.0
ZPP ≥ 66 (μmol ZP/mole Heme) (%) 40.64 43.44 30.02 44.26
  1. ŧ As the last time (60 months) had the lower lead concentration in blood, this point was taken as the basal level of exposure.
  2. b Values are medians (range).
  3. *. p < 0.05 two sided Fisher's exact test.