Quality of the EEG1 signal vs Sleep Heart Health Study (SHHS) Visit Number

	Visit 1	Interim Follow-up Visit	Visit 2	CVD Outcomes
Total	5,804	-	-	-
Less than 2 hours of artifact-free signal	180	-	-	-
At least 2 hours but less than 4 hours of artifact-free signal	355	-	-	-
At least 4 hours but less than 6 hours of artifact-free signal	1,694	-	-	-
At least 6 hours of artifact-free signal	3,575	-	-	-

Quality of the EEG1 signal vs Age at Sleep Heart Health Study Visit One (SHHS1)

Visit 1

	35-44 years	45-54 years	55-64 years	65-74 years	75-84 years	85 years or older	Total
Total	342	1,017	1,769	1,617	955	104	5,804
Less than 2 hours of artifact-free signal	7	25	52	58	33	5	180
At least 2 hours but less than 4 hours of artifact-free signal	27	53	95	93	76	11	355
At least 4 hours but less than 6 hours of artifact-free signal	95	279	521	478	285	36	1,694
At least 6 hours of artifact-free signal	213	660	1,101	988	561	52	3,575

Quality of the EEG1 signal vs Gender of the participant

Visit 1

	Male	Female	Total
Total	2,765	3,039	5,804
Less than 2 hours of artifact-free signal	84	96	180
At least 2 hours but less than 4 hours of artifact-free signal	184	171	355
At least 4 hours but less than 6 hours of artifact-free signal	831	863	1,694
At least 6 hours of artifact-free signal	1,666	1,909	3,575

Quality of the EEG1 signal vs Race of the participant

Visit 1

	White	Black	Other	Total
Total	4,907	515	382	5,804
Less than 2 hours of artifact-free signal	140	26	14	180
At least 2 hours but less than 4 hours of artifact-free signal	273	69	13	355
At least 4 hours but less than 6 hours of artifact-free signal	1,413	178	103	1,694
At least 6 hours of artifact-free signal	3,081	242	252	3,575