Table 2.

Detection frequencies (DF, %), the mean (with their standard errors), minimum, 25th percentile, median, 75th percentile, 95th percentile, and maximum concentrations of each QAC measured in breast milk (ng/mL; n = 48) and their contributions (contr, %) to the ∑QAC concentrations.

	DF	Mean ± SE	Min	25th	Median	75th	95th	Max	Contr.
	%	ng/mL	ng/mL	ng/mL	ng/mL	ng/mL	ng/mL	ng/mL	%
BACs
C8-BAC	0		<MQL						--*
C10-BAC	79	0.0047 ± 0.00035	<MQL	0.0031	0.0049	0.0054	0.0098	0.011	0.37
C12-BAC	81	0.51 ± 0.067	<MQL	0.14	0.38	0.69	1.5	2.2	29
C14-BAC	67	0.56 ± 0.064	<MQL	<MQL	0.45	0.80	1.3	2.1	35
C16-BAC	69	0.12 ± 0.018	<MQL	<MQL	0.088	0.17	0.32	0.52	6.7
C18-BAC	10	0.34 ± 0.18	<MQL	<MQL	<MQL	<MQL	0.87	0.95	--*
∑BAC	90	1.2 ± 0.14	<MQL	0.40	0.92	1.7	3.3	4.1	71
DDACs
C8-DDAC	8	0.25 ± 0.23	<MQL	<MQL	<MQL	<MQL	0.81	0.94	--*
C10-DDAC	8	1.5 ± 0.44	<MQL	<MQL	<MQL	<MQL	2.6	2.8	--*
C12-DDAC	0		<MQL						--*
C14-DDAC	0		<MQL						--*
C16-DDAC	0		<MQL						--*
C18-DDAC	0		<MQL						--*
∑DDAC	15	1.0 ± 0.35	<MQL	<MQL	<MQL	<MQL	2.3	2.8	--*
ATMACs
C8-ATMAC	6	0.054 ± 0.016	<MQL	<MQL	<MQL	<MQL	0.082	0.087	--*
C10-ATMAC	6	0.093 ± 0.042	<MQL	<MQL	<MQL	<MQL	0.16	0.17	--*
C12-ATMAC	44	0.062 ± 0.020	<MQL	<MQL	<MQL	0.079	0.17	0.43	--*
C14-ATMAC	85	0.21 ± 0.032	<MQL	0.073	0.16	0.24	0.54	1.4	12
C16-ATMAC	88	0.39 ± 0.099	<MQL	0.13	0.21	0.31	1.4	4.4	16
C18-ATMAC	65	0.031 ± 0.0059	<MQL	<MQL	0.013	0.027	0.11	0.19	1.0
∑ATMAC	98	0.67 ± 0.11	<MQL	0.28	0.44	0.63	2.0	4.6	29
∑QACs	100	2.0 ± 0.24	0.33	0.88	1.5	2.9	5.0	7.4	100

*Percent contribution to the ∑QAC concentration was not calculated because of DF < 50%. <MQL: concentrations below the method quantification limit; SE standard error. Some concentrations are below the blank levels because the data was blank-corrected by subtracting the average blank levels from sample levels.