Table 4.

Factors associated with high nail Hg levels in controls.

	Analysis restricted to controls:	Toenail Hg by 90th percentile		univariate multivariable*
		<90th	≥90th	p-value	OR	(95%CI)
		n=1094	n=122
Age (mean (SD))		46.81 (6.20)	46.79 (6.26)	0.96	0.99	(0.96–1.02)
Smoking (%)		n (%)	n (%)	0.014
	never	737 (67.4)	68 (55.7)		1.0 ref
	current	87 (8.0)	9 (7.4)		1.27	(0.54–2.63)
	past	270 (24.7)	45 (36.9)		1.97	(1.29–3.00)
	Ever smoker	357 (32.6)	54 (44.3)	0.013
Race, ethnicity (%)				0.91
	Non-Hisp. White	980 (89.7)	109 (89.3)
	Other	113 (10.3)	13 (10.7)
Education level of participant (%)				0.048
	High school or less	122 (11.2)	11 (9.0)
	Some college or technical
	degree	359 (32.8)	27 (22.1)
	Bachelor’s degree	353 (32.3)	51 (41.8)
	Master or Doctoral degree	260 (23.8)	33 (27.0)
Household income per-person (mean (SD))		$38,263 (23,921)	$56,393 (35,211)	3.37E–07
Income bracket (%)				1.80E–06
	Less than $100,000	614 (58)	45 (39)		1.0 ref
	$100,000 to $200,000	363 (34)	45 (39)		1.75	(1.13–2.71)
	$200,000+	89 (8)	25 (22)		4.05	(2.32–6.96)

^*Model includes age, smoking status, income bracket. Missing race n=1, income n=35.