Skip to main content
. 2020 Jun 3;128(6):067001. doi: 10.1289/EHP5842

Figure 1.

Figure 1 is a flow diagram (from top to bottom) with N equals 3,481,610 in 4 air basins (2006 to 2015), N equals 3,313,212 geocoded births (2006 to 2015), N=3,213,091 births (2006 to 2015) after removing births without last menstrual period (LMP), N=3,076,786 births (2006 to 2015) after additional exclusion criteria, N equals 2,987,429 births within 10 kilometers of at least one production well, and N equals 2,918,089 births analyzed are connected with arrows. The exclusion criteria excluded (N equals 168,398): no address (n equals 19,626) and address with no geocode matches (n equals 148,772), excluded (N equals 100,121): missing last menstrual period (LMP), excluded, (N equals 136,305): plural births, congential anomalies, implausible birth weight, and implausible gestational age, and excluded, (N equals 89,357): no wells within 10 kilometers of residence during pregnancy are placed to the right of respective arrows.

Flow diagram of study population development and exclusion criteria applied.