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. Author manuscript; available in PMC: 2016 Feb 1.
Published in final edited form as: Environ Sci Pollut Res Int. 2015 May 17;23(3):2014–2021. doi: 10.1007/s11356-015-4684-3

Table 1.

Mean ACHS concentrations of three representative PCB congeners and associated sample size required for ACHS-II.

PCB
Congener		 Congener
characteristics		 Mean ACHS PCB
Concentration
C(0), in ng/g lipid		 Standard
Deviation of
ACHS PCB
Concentration		 Mean change
in PCB
Concentration
at t=7
years: H0: HL
= 14 years		 Mean change
in PCB
Concentration
at t=7
years: HA: HL
= 20 years		 Sample
Size at
80%
Power
and
α=0.05*
118 5 chlorines
Mono-ortho
substituted
Partially dioxin-like		 70 177 −20.5 −15.1 420
153 6 chlorines
Mono-ortho
substituted
Non-dioxin-like		 218 409 −63.9 −47.0 232
206 9 chlorines
Tetra-ortho
substituted
Non-dioxin-like		 40 98 −11.7 −8.62 395

HO - null hypothesis, HA - alternative hypothesis, HL – half life.