Table 2. Distribution1 of the number and IDW sum of active UGD wells near women's residences during pregnancy, among 158,894 women with a singleton birth or fetal death in the 24-county Barnett Shale area, Texas, Nov. 30, 2010—Nov. 29, 2012, by buffer size.
Buffer | 25% | 50% | 75% | 95% | Max |
---|---|---|---|---|---|
½ Mile | |||||
Count | 2 | 3 | 6 | 12 | 32 |
IDW Sum | 13.4 | 31.4 | 70.1 | 208.2 | 13447.3 |
2 Miles | |||||
Count | 12 | 28 | 47 | 92 | 168 |
IDW Sum | 7.9 | 24.0 | 51.2 | 151.0 | 13145.6 |
10 Miles | |||||
Count | 70 | 413 | 1,048 | 1,637 | 2,374 |
IDW Sum | 1.0 | 19.2 | 63.6 | 163.3 | 13480.1 |
IDW: inverse distance weighted; UGD: unconventional gas development; Max: maximum.
1Calculated among women with ≥1 well within the specified buffer