Table 4.
Average concentrations of chromium (Cr), mercury (Hg), nickel (Ni), and lead (Pb) in house dust and airborne dust stratified by asthma status.
| Asthma (51) | Non Asthma (51) | p | |||||
|---|---|---|---|---|---|---|---|
| Range | Mean ± SD | Median IQR | Range | Mean ± SD | Median IQR | ||
| House dust (mg/kg) | |||||||
| Cr | ND–6.33 | 1.31 ± 1.23 | 1.35 | 0.03–5.87 | 1.30 ± 1.21 | 1.48 | 0.894 |
| Hg | ND–0.79 | 0.06 ± 0.16 | 0.07 | ND–1.04 | 0.07 ± 0.16 | 0.08 | 0.944 |
| Ni | ND–4.60 | 1.02 ± 0.87 | 0.87 | ND–12.00 | 1.31 ± 1.99 | 1.41 | 0.671 |
| Pb | ND–23.47 | 3.83 ± 4.64 | 4.64 | ND–79.27 | 6.26 ± 12.76 | 6.00 | 0.955 |
| Air dust (µg/m3) | |||||||
| Cr | ND–0.14 | 0.03 ± 0.03 | 0.05 | ND–0.13 | 0.02 ± 0.03 | 0.04 | 0.049 |
| Hg | 0.02–0.25 | 0.13 ± 0.07 | 0.13 | ND–0.26 | 0.12 ± 0.07 | 0.08 | 0.651 |
| Ni | ND–0.13 | 0.03 ± 0.03 | 0.06 | ND–0.13 | 0.03 ± 0.03 | 0.05 | 0.294 |
| Pb | ND–0.23 | 0.07 ± 0.07 | 0.12 | ND–1.66 | 0.08 ± 0.23 | 0.12 | 0.629 |
IQR, interquartile range; ND, not detected; SD, standard deviation. Mann-Whitney U test significance set at α = 0.05.