Table 4.

Percent difference^a in relative telomere length by serum polychlorinated biphenyls (PCBs), ACHS participants

	White			African American
	%Difference	95% CI		%Difference	95% CI
PCB 99
Per doubling of exposure	1.65	0.36	2.94	−0.05	−1.17	1.08
<29.15 ppt	Referent			Referent
29.15–71.60 ppt	2.31	−2.13	6.97	−2.42	−8.74	4.32
71.60–189.60 ppt	4.67	−0.40	9.99	2.22	−4.68	9.63
>189.60 ppt	8.84	1.77	16.41	−0.49	−7.20	6.71
p for trend	0.01			0.90
p for quadratic	0.69			0.64
PCB 105
Per doubling of exposure	1.77	0.40	3.15	0.18	−0.57	0.93
<7.75 ppt	Referent			Referent
7.75–19.10 ppt	2.01	−2.43	6.66	1.30	−4.14	7.05
19.10–58.20 ppt	3.46	−1.84	9.03	7.15	1.55	13.05
>58.20 ppt	10.45	3.50	17.87	1.01	−4.12	6.41
p for trend	0.01			0.52
p for quadratic	0.25			0.03
PCB 118
Per doubling of exposure	1.87	0.55	3.21	0.02	−1.07	1.12
<49.60 ppt	Referent			Referent
49.60–121.60 ppt	3.05	−1.60	7.93	−0.62	−6.71	5.87
121.60–361.80 ppt	4.70	−0.69	10.38	6.05	−0.65	13.21
>361.80 ppt	9.88	2.76	17.49	−0.24	−6.89	6.88
p for trend	0.01			0.88
p for quadratic	0.68			0.05
PCB 153
Per doubling of exposure	1.75	0.26	3.26	−0.74	−1.94	0.47
<278.75 ppt	Referent			Referent
278.75–564.95 ppt	5.40	0.53	10.51	0.67	−6.06	7.89
564.95–1398.50 ppt	7.08	1.64	12.82	2.39	−4.42	9.70
>1398.50 ppt	7.62	0.57	15.15	−1.64	−8.26	5.46
p for trend	0.02			0.40
p for quadratic	0.19			0.15
PCB 167
Per doubling of exposure	1.33	−0.20	2.89	−0.02	−1.20	1.17
<10.88 ppt	Referent			Referent
10.88–22.55 ppt	2.08	−3.00	7.43	1.87	−5.52	9.83
22.55–57.20 ppt	3.82	−1.65	9.58	1.73	−5.27	9.24
>57.20 ppt	8.58	1.54	16.10	−0.50	−7.45	6.98
p for trend	0.02			0.63
p for quadratic	0.57			0.33
PCB 183
Per doubling of exposure	1.60	0.05	3.17	−0.13	−1.34	1.09
<18.65 ppt	Referent			Referent
18.65–39.25 ppt	2.59	−2.12	7.53	−0.53	−7.08	6.49
39.25–93.40 ppt	5.79	0.42	11.45	3.08	−3.74	10.37
>93.40 ppt	6.24	−0.80	13.79	0.43	−6.36	7.72
p for trend	0.03			0.83
p for quadratic	0.63			0.40
PCB 187
Per doubling of exposure	1.22	−0.19	2.64	−0.26	−1.42	0.92
<68.65 ppt	Referent			Referent
68.65–159.50 ppt	5.56	0.42	10.95	2.52	−4.62	10.20
159.50–394.75 ppt	7.67	1.96	13.70	4.38	−3.07	12.40
>394.75 ppt	6.01	−0.98	13.49	0.73	−6.65	8.70
p for trend	0.04			0.73
p for quadratic	0.07			0.09
PCB 196
Per doubling of exposure	1.21	−0.43	2.87	−0.24	−1.57	1.10
<47.00 ppt	Referent			Referent
47.00–110.85 ppt	6.30	0.53	12.40	0.45	−6.38	7.78
110.85–249.35 ppt	8.59	2.02	15.59	−1.35	−8.59	6.46
>249.35 ppt	9.23	1.32	17.76	−0.96	−8.11	6.73
p for trend	0.02			0.67
p for quadratic	0.16			0.93
PCB 199
Per doubling of exposure	0.51	−0.96	1.99	−0.60	−1.82	0.65
<51.75 ppt	Referent			Referent
51.75–132.10 ppt	4.98	−0.78	11.07	−3.28	−9.85	3.77
132.10–318.30 ppt	7.65	0.92	14.83	−4.34	−11.13	2.96
>318.30 ppt	2.45	−4.78	10.23	−3.63	−10.50	3.76
p for trend	0.55			0.49
p for quadratic	0.01			0.33

^aAdjusted for age in years, age in years squared, total lipids, plate, smoking status, diabetes, education, sex, alcohol use in the past 30 days, and body mass index.