. 2017 Jul 21;12(7):e0180966. doi: 10.1371/journal.pone.0180966

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

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.