Polybrominated diphenyl ether serum concentrations in a Californian population of children, their parents, and older adults: an exposure assessment study

Table 1 Distribution of PBDE serum concentrations (ng/g lipid) in three age classes in California at baseline visit ^a

PBDE	Overall % detected	Children (N = 68)				Parents of young children (N = 90)				Older adults (N = 59)				Diff by age ( p -value) ^b
PBDE	Overall % detected	% detected	GM	P75	P95	% detected	GM	P75	P95	% detected	GM	P75	P95	Diff by age ( p -value) ^b
BB-153	80%	60%	0.92	1.80	5.40	82%	1.22	2.10	5.00	100%	2.54	3.40	8.90	<0.001
BDE-17	18%	40%	0.34	0.85	1.70	7%	0.05	—	0.70	10%	0.08	—	2.00	—
BDE-28	84%	84%	2.25	4.55	11.6	93%	1.41	2.50	5.20	71%	1.30	3.10	12.3	0.004
BDE-47	100%	100%	61.8	115	364	100%	20.8	39.8	94.2	100%	25.4	44.3	193	<0.0001
BDE-66	22%	38%	0.41	0.80	1.50	12%	0.14	—	0.70	19%	0.19	—	1.30	—
BDE-85	53%	76%	1.29	2.55	6.60	44%	0.36	0.80	2.20	41%	0.38	0.80	4.90	—
BDE-99	99%	99%	13.0	24.2	77.9	98%	3.78	6.30	26.1	100%	4.11	9.30	46.2	<0.0001
BDE-100	99%	100%	12.7	21.1	64.0	98%	3.77	7.30	21.0	100%	4.40	6.50	60.0	<0.0001
BDE-153	100%	100%	16.1	26.2	86.7	100%	6.76	15.0	48.9	100%	7.32	11.9	101	<0.0001
BDE-154	51%	74%	1.11	2.20	5.30	38%	0.31	0.60	1.80	46%	0.40	0.80	4.30	—
BDE-183	15%	15%	0.20	—	0.80	12%	0.13	—	0.50	19%	0.18	—	0.80	—
BDE-209	16%	24%	2.76	—	9.60	8%	1.25	—	8.00	20%	1.76	—	7.40	—

^aAnalyses include values below the limit of detection. Geometric means (GM) are maximum likelihood estimates for log-normally distributed data left-censored at the LOD. GM for values with low detection percentages should be interpreted with caution.
^bPr > |Wald Chi-square| to test the null hypothesis that geometric mean PBDE serum concentrations are equal for the three groups. Comparisons performed only when at least 60% of values above detection limits in all three groups.

ISSN: 1476-069X