Table 3:

Association of sex, age, education, race, depression, marital status, and income with EEG power (EO-EC) at 8, 20, and 100 Hz. NA codes for absence of missing data for a given predictor.

	8 Hz		20 Hz		100 Hz
	β (CI)	p-value	β (CI)	p-value	β (CI)	p-value
Sex
Male			[reference]
Female	1.22 (0.43, 2.00)	<0.01	8×10−3 (−0.01, 0.03)	0.45	1×10−4 (−2×10−3, 2×10−3)	0.88
Missing	NA	NA	NA	NA	NA	NA
Age
4			[reference]
5	0.73 (−0.46, 1.91)	0.23	−0.04 (−0.07, −0.01)	<0.01	−9×10−4 (−3×10−3, 2×10−3)	0.51
7	1.52 (0.37, 2.66)	<0.01	−0.07 (−0.10, −0.04)	<1×10−5	8×10−4 (−2×10−3, 3×10−3)	0.54
9	2.15 (0.77, 3.52)	<0.01	−0.09 (−0.12, −0.05)	<1×10−6	3×10−4 (−3×10−3, 3×10−3)	0.83
11	1.64 (0.14, 3.13)	0.03	−0.17 (−0.20, −0.13)	<1×10−15	5×10−5 (−3×10−3, 3×10−3)	0.98
Missing	NA	NA	NA	NA	NA	NA
Education
Any Primary			[reference]
Some High	6.20 (1.64, 10.77)	<0.01	−0.06 (−0.18, 0.05)	0.27	−0.01 (−0.02, −6×10−4)	0.04
Completed High	4.99 (0.56, 9.42)	0.03	−0.06 (−0.17, 0.05)	0.31	−0.01 (−0.02, −4×10−3)	<0.01
Beyond High	5.29 (0.94, 9.63)	0.02	−0.06 (−0.16, 0.05)	0.31	−0.01 (−0.02, −3×10−3)	0.01
Missing	NA	NA	NA	NA	NA	NA
Race
American Indian or Alaska Native			[reference]
White	−0.32 (−1.75, 1.10)	0.66	−0.01 (−0.05, 0.02)	0.42	3×10−4 (−3×10−3, 3×10−3)	0.83
Other	−2.16 (−3.98, −0.34)	0.02	−1×10−3 (−0.05, 0.04)	0.96	1×10−3 (−3×10−3, 5×10−3)	0.59
Missing	NA	NA	NA	NA	NA	NA
Depression
Normal			[reference]
Probable	1.14 (−1.46, 3.75)	0.39	−0.01 (−0.08, 0.05)	0.65	9×10−4 (−5×10−3, 6×10−3)	0.75
Major	−1.63 (−5.11, 1.86)	0.36	−0.05 (−0.13, 0.04)	0.29	−1×10−3 (−9×10−3, 6×10−3)	0.76
Missing	NA	NA	NA	NA	NA	NA
Married
No			[reference]
Yes	−0.02 (−1.39, 1.34)	0.97	0.01 (−0.02, 0.05)	0.51	2×10−3 (−9×10−4, 5×10−3)	0.18
Missing	NA	NA	NA	NA	NA	NA
Income
$250–$3500			[reference]
>$3500	−0.16 (−1.02, 0.70)	0.71	−4×10−3 (−0.03, 0.02)	0.69	−2×10−4 (−2×10−3, 2×10−3)	0.82
Missing	1.16 (−3.85, 6.18)	0.65	−0.02 (−0.17, 0.13)	0.76	0.01 (−7×10−4, 0.02)	0.07