Table 4.

Serum [PFOA] in ng/ml by primary residential source of drinking water^a,^b. All Participants (randomly selected and local volunteers)

Drinking Water Source	N	Median	Mean	IQR	Range
Little Hocking system water only	291	374	448	221–576	7–1950
Little Hocking system plus bottled or spring	26	320	358	206–370	72–1280
Bottled and/or cistern and/or spring only*	10	71	154	49–217	12–527
Well water and well & other	26	79	296	28–155	8–4520

^aSubjects with substantial occupational exposure to PFOA were excluded from these analyses

^b7 subjects did not indicate residential source of drinking water

^*Significantly different from Little Hocking water only (p=.003 ) and Little Hocking system plus bottled or spring water (p=.05)