Table 5.
Average concentrations of blood lead (Pb) and urinary mercury (Hg), nickel (Ni), and chromium (Cr) in study subjects stratified by asthma status.
| Heavy Metal in Biological Sample Heading | Asthma (51) | Non Asthma (51) | p | ||||
|---|---|---|---|---|---|---|---|
| Range | Mean ± SD | Median IQR | Range | Mean ± SD | Median IQR | ||
| Blood Pb (µg/dL) | 0.89–8.50 | 4.80± 1.97 | 3.14 | 1.61–9.67 | 4.83 ± 2.16 | 3.23 | 0.857 * |
| Urinary Cr (µg/g creatinine) | ND–4.99 | 0.69 ± 0.99 | 0.53 | 0.06–5.03 | 0.71 ± 0.89 | 0.64 | 0.410 ** |
| Urinary Hg (µg/g creatinine) | 0.07–52.64 | 3.69± 8.60 | 1.51 | 0.31–24.16 | 3.06 ± 4.43 | 1.81 | 0.933 ** |
| Urinary Ni (µg/g creatinine) | 0.73–29.82 | 5.63 ± 6.66 | 3.33 | 0.25–99.96 | 6.81 ± 14.44 | 3.76 | 0.960 ** |
IQR, interquartile range; ND, not detected; SD, standard deviation. * t-test; ** Mann-Whitney U test set at α = 0.05.