Design, Methods, and Population for a Study of PFOA Health Effects among Highly Exposed Mid-Ohio Valley Community Residents and Workers

http://dx.doi.org/10.1289/ehp.1206450



Table 3. Serum PFOA concentrations in target and final populations, among those who participated in the C8HP.
  Community cohort Worker cohort Final combined cohort(= 30,431)
Target population (= 40,145)a Respondents to ≥ 1 survey during 2008–2011 (= 32,712) Respondents to ≥ 1 survey during 2008–2011 with no evidence of working at the plant (= 28,560)b Included in final cohort (= 28,541)c Target population (= 2,090) Included in final cohort (= 1,890)d
aConsented among those in C8HP of qualifying age. bEvidence of working at the plant was based on survey responses to questions about occupational history and working at the plant as well as whether the person was also in the worker cohort. cThe final community cohort included those who did not have evidence of working at the plant, responded to at least one survey, and had available serum PFOA concentration estimates. dThe final worker cohort included those who responded to at least one survey and had available serum PFOA concentration estimates.
Mean 85.7 89.6 70.9 70.9 317.2 324.6 86.6
SD 262.2 277.6 151.2 151.2 889.4 920.6 278.9
25th percentile 12.8 13.1 12.3 12.3 53.4 55.9 12.8
Median 26.1 27.2 24.2 24.2 109.8 112.7 26.1
75th percentile 68.6 72.3 58.9 58.9 254.6 256.2 68.1
No. with measurements 39,954 32,577 28,441 28,422 2,081 1,881 30,303