Table 2.

Child Age 9 Serum Concentration by Collection Year^a

compd	serum concentration (ng/g of lipid) of child age 9
	year 2009			year 2010			year 2011			ANOVA level of significance
	N	GMb	95% CI	N	GM	95% CI	N	GM	95% CI	F	2009 vs 2010	2009 vs 2011	2010 vs 2011
Polybrominated Diphenyl Ethers (PBDEs)
BDE-28	67	1.71	1.47–1.99	187	1.45	1.32–1.59	216	1.37	1.47–1.99	0.06	0.06	<0.05	0.45
BDE-47	67	44.7	37.7–53	187	35.8	32.3–39.6	215	32.2	37.7–53	<0.01	<0.05	<0.01	0.17
BDE-85	67	0.92	0.79–1.06	186	0.75	0.69–0.82	213	0.73	0.79–1.06	<0.05	<0.05	<0.01	>0.5
BDE-99	68	10.9	9.02–13.1	187	7.59	6.79–8.5	215	7.2	9.02–13.1	<0.01	<0.01	<0.001	>0.5
BDE-100	65	9.26	7.94–10.8	184	7.86	7.16–8.63	213	6.91	7.94–10.8	<0.01	0.07	<0.01	0.07
BDE-153	68	10.8	9.33–12.5	181	9.46	8.64–10.4	213	8.47	9.33–12.5	<0.05	0.13	<0.01	0.10
BDE-154	63	1.02	0.88–1.18	173	0.79	0.72–0.86	202	0.77	0.88–1.18	<0.01	<0.01	<0.01	>0.5
Polychlorinated Biphenyls (PCBs)
CB-74	60	0.68	0.61–0.75	185	0.72	0.68–0.77	214	0.7	0.61–0.75	0.49	0.24	>0.5	>0.5
CB-99	68	0.89	0.8–0.99	186	0.87	0.81–0.92	214	0.66	0.8–0.99	<0.001	>0.5	<0.001	<0.001
CB-118	66	0.99	0.9–1.08	186	1.05	0.99–1.11	212	0.9	0.9–1.08	<0.01	0.26	0.1	<0.001
CB-138/158	67	1.55	1.38–1.74	186	1.53	1.43–1.65	210	1.34	1.38–1.74	<0.05	>0.5	<0.05	<0.05
CB-153	65	1.91	1.69–2.16	187	1.89	1.75–2.04	213	1.66	1.69–2.16	<0.05	>0.5	0.06	<0.05
CB-180	65	1.15	1–1.32	188	1.18	1.09–1.29	212	1.01	1–1.32	<0.05	>0.5	0.13	<0.05
Persistent Pesticides
p,p′-DDE	66	136	115–163	182	146	131–162	208	128	115–163	0.27	>0.5	>0.5	0.11

^aThe ANOVA p-value comparing collection years is given, as well as the total number of available samples by year.

^bGM, geometric mean.