Table 2 Distribution of the PCBs serum concentration of the study population (n = 181).

Parameters	Mean ± SD	Range	Median	IQR
ΣNdl-PCBs, ng/g lipid	4.708 ± 2.890	0.35–15.34	4.07	2.47–5.97
PCB 28, ng/g lipid	0.063 ± 0.155	0.01–1.18	0.01^b	0.01–0.01
PCB 52, ng/g lipid	0.038 ± 0.071	0.01–0.48	0.01^b	0.01–0.01
PCB 99, ng/g lipid	0.051 ± 0.053	0.01–0.29	0.02^a	0.01–0.09
PCB 101, ng/g lipid	0.025 ± 0.040	0.01–0.32	0.01^b	0.01–0.01
PCB 138, ng/g lipid	1.937 ± 1.680	0.09–7.50	1.68	1.04–2.62
PCB 153, ng/g lipid	2.486 ± 1.438	0.15–8.14	2.20	1.43–3.22
PCB 180, ng/g lipid	0.117 ± 0.144	0.01–0.92	0.08	0.01–0.15
Σdl-PCBs, ng/g lipid	0.116 ± 0.150	0.02–1.04	0.07	0.02–0.13
PCB 114, ng/g lipid	0.063 ± 0.104	0.01–0.66	0.02^a	0.01–0.08
PCB 118, ng/g lipid	0.042 ± 0.042	0.01–0.22	0.02^a	0.01–0.07
Σdl-PCBs, pg/g lipid	116.685 ± 150.399	20.00–1040.00	70.00	20.00–150.00
ΣPCBs, ng/g lipid	4.810 ± 2.978	0.37–15.68	4.08	2.51–6.15

CI confidence interval, OR odds ratio, ΣPCBs total polychlorinated biphenyls, ΣNdl-PCBs non-dioxin-like-PCBs, Σdl-PCBs dioxin-like-PCBs, IQR interquartile range.
^aThe numbers reported are the closest to the 50th percentile, and they were considered as an estimation of the median.
^bMore than 70% of the samples were less than the detection limit, so the median value set half of the LOD.

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