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Table 3 Frequency distribution of the levels (ppt TEQ) for dioxins in soil classified by depth and location

From: Spatial variations in the incidence of breast cancer and potential risks associated with soil dioxin contamination in Midland, Saginaw, and Bay Counties, Michigan, USA

Categories Sample size Mean Min Max Stdev 25th P 75th P Med
Depth (in inches)         
0 – 3 307 500 0 15,300 1,440 15 442 83
3 – 6 112 350 0 2,790 590 5.56 525 56.3
6 – 15 102 355 0 5,660 799 3.14 356 44.3
15 – 24 3 576 6.9 1,620 909 6.9 1,620 97.5
24 – 36 3 56.9 13.9 133 65.9 13.9 133 23.9
36 – 48 3 24.1 1.12 64 34.6 1.12 64 7.34
48 – 60 2 6.77 1.42 12.1 7.57 1.42 12.1 6.77
Locations         
Midland 53 1,140 0 15,300 3,040 69.6 111 727
Floodplain         
1-year 191 564 0 5,660 725 62.1 923 308
2-year 80 364 0.17 3,140 632 30.4 438 99.3
5-year 29 39.8 0.18 294 74.2 5.63 32.5 16
10-year 32 34.6 0 244 62.2 3.53 41.2 7.17
50-year 44 206 0 5,070 792 2.23 34.1 8.74
100-year 43 481 0 6,450 1,130 1.1 531 26.4
500-year 15 13.7 0.23 69.7 20.1 3.45 11.6 4.5
Outside 35 13.9 0 76.8 20.3 1.8 22.4 4.55
Saginaw 10 96.3 0.73 450 136 9.81 142 50.4
Total 532        
  1. aStdev, standard deviation