| Playground | Low traffic density | Moderate density | High traffic density |
| est. traffic density | 2 479 | 8 400 | 23 850 |
|
dust lead levels (mg/g) summer winter |
0.098 ± 0.049 (10) 0.073 ± 0.059 (10) |
0.202 ± 0.073 (9) 0.151 ± 0.050 (10) |
0.325 ± 0.097 (10) 0.412 ± 0.148 (10) |
| significance
summer vs. winter summer winter |
p > 0.1 ns low vs. mod. p < 0.001 sig low vs. mod. p < 0.01 sig |
p > 0.05 ns
mod. vs. high p<0.01 sig mod. vs. high p < 0.01 sig |
|
| swab levels (ug/swab)
summer |
10.09 ± 9.09 (10) | 27.48 ± 16.13 (10) | |
| significance | low vs. mod. p < 0.01 sig | mod. vs. high p < 0.001 sig | low vs. high p < 0.001 sig |