Table 2.

Toenail Arsenic Concentrations by Characteristics of Participants (n = 226), Normative Aging Study, Boston, Massachusetts, 2000–2002, 2006

Characteristic	No. of Participants	Median Toenail Arsenic Concentration, μg/g	Interquartile Range, μg/g
Age, years
<73	106	0.08	0.06
≥73	120	0.06	0.05
Body mass index, kg/m2
<25	54	0.07	0.07
25–29	123	0.07	0.06
≥30	49	0.08	0.04
Current smoking status
Smoker	10	0.09	0.12
Nonsmoker	216	0.07	0.06
Lifetime smoking, pack-years
<26	77	0.07	0.05
≥26	80	0.07	0.06
Serum C-reactive protein, mg/L
<1.8	113	0.07	0.06
≥1.8	113	0.07	0.05
Fasting glucose, mg/dL
<100	109	0.07	0.05
≥100	117	0.07	0.06
Mean arterial pressure, mm Hg
<95	112	0.08	0.06
≥95	114	0.07	0.06
Dark-meat fish intake, servings
<1/month	93	0.07	0.06
1/month–6/week	105	0.07	0.05
Other fish intake, servings
<1/month	60	0.07	0.06
1/month–6/week	138	0.07	0.05
Shellfish intake, servings
<1/month	84	0.06	0.06
1/month–6/week	114	0.07	0.05
Intake of canned tuna, servings
<1/month	56	0.07	0.05
1/month–6/week	142	0.07	0.05
Season of clinical visit
Spring	63	0.06	0.04
Summer	49	0.09	0.07
Fall	63	0.08	0.08
Winter	51	0.06	0.03
Year of clinical visit
2000	17	0.06	0.03
2001	135	0.07	0.06
2002	52	0.07	0.06
2006	22	0.09	0.07