Table 1.

Population characteristics.

	Controls n=210	ALS patients n=70	univariate p-value
Age (mean (range))	54.0 (35–66)	55.5 (30–66)	0.08
Smoking	n (%)	n (%)
never	129 (61.4)	34 (48.6)	0.13
current	13 (6.2)	4 (5.7)
past	68 (32.4)	32 (45.7)
Smoked <5 years	147 (70.0)	42 (60.0)	0.16
5+ years	63 (30.0)	28 (40.0)
Education			0.085
High school or less	32 (15.2)	12 (17.1)
Technical or some college	72 (34.3)	13 (18.6)
College degree	51 (24.3)	24 (34.3)
Graduate school	55 (26.2)	21 (30.0)
Race / ethnicity			1
White, non-hispanic	203 (96.7)	68 (97.1)
Other	7 (3.3)	2 (2.9)