Table 3.

Serum [PFOA] in ng/ml by community area, for randomly selected participants and for all participants^a.

Community Areas with Higher Expected Contribution from Air	Randomly Selected Participants				All Participants (local volunteers and randomly selected)
	N	Mean	Median	IQR	N	Mean	Median	IQR
Belpre	14	321	298	83–533	30	307	244	103–445
Little Hocking	74	478	327	187–572	92	458	311	175–567
TOTAL	88	453	326	176–568	122	421	298	155–556
Community Areas with Minimal Expected Contribution from Air
	N	Mean	Median	IQR	N	Mean	Median	IQR
Cutler	59	361	316	169–477	70	380	314	185–477
Vincent	160	439	370	190–570	168	438	370	188–577
TOTAL	219	418	368	182–555	238	421	361	186–555

^a18 subjects with substantial occupational exposure were excluded from analysis.