Table 1.

Distribution of selected characteristics by self-reported sleep duration among study population (n=101,609).^a

Characteristic	Sleep Duration						X2 p-value'b
	3-6 hrs/day		7-9 hrs/day		≥ 10 hrs/day
	N	%	N	%
All	26,440	100	74,211	100	958	100
Age at baseline (years)
20-29	972	4	3,817	5	30	3
30-39	3,240	12	10,882	15	79	8
40-49	7,319	28	20,417	28	135	14
50-59	7,153	27	17,820	24	159	17
60-69	4,303	16	11,835	16	192	20
70-79	2,555	10	6,942	9	158	17
≥ 80	898	3	2,498	3	205	21	0.001
Race/Ethnicity
White	21,293	80	66,109	89	820	86
Black	1,273	5	1,229	2	30	3
Hispanic	1,494	6	2,833	4	46	5
Asian/Pacific Islander	1,474	6	2,110	3	22	2
Other/unknown	906	3	1,930	2	40	4	<0.001
Physical activity, strenuous & moderate, last 3 years (hrs/week)
0-1.1	9,700	37	23,513	32	525	55
1.2-4.1	8,298	31	25,397	34	202	21
≥ 4.2	8,442	32	25,301	34	231	24	<0.001
Body Mass Index (kg/m2)
16-24	14,267	54	45,269	61	477	50
25-29	6,684	25	17,158	23	237	25
≥ 30	4,290	16	9,152	12	160	16
Unknown/ Outlier	1,199	5	2,632	4	84	9	<0.001
Alcohol consumption (g/day)
None	9,178	35	22,776	31	414	43
< 20	14,196	54	41,663	56	385	40
≥ 20	1,670	6	6,183	8	89	9
Unknown	1,396	5	3,589	5	70	8	<0.001
Smoking status
Never	17,573	66	49,483	67	593	62
Former	7,161	27	20,925	28	295	31
Current	1,558	6	3,447	5	63	6
Unknown	148	1	356	0	7	1	<0.001
Menopausal Status/HT usec
Premenopausal	10,240	39	32,131	43	219	23
Peri/post-menopausal, No HT use	3,475	13	7,940	11	219	23
Peri/post-menopausal, Past HT use	1,829	7	4,610	6	119	12
Peri/post-menopausal, Current E	3,531	13	9,183	12	128	13
Peri/post-menopausal, Current E+P	3,586	14	11,067	15	123	13
All Other	3,779	14	9,280	13	150	16	<0.001
Co-morbidityd
No	19,856	75	59,066	80	575	60
Yes	6,584	25	15,145	20	383	40	<0.001
Neighborhood Socioeconomic Status
Lowest quartile	6,818	26	17,076	23	235	25
2nd quartile	6,210	23	17,673	24	239	25
3rd quartile	6,285	24	17,619	24	220	23
Highest quartile	5,893	22	18,036	24	205	21
Unknown	1,234	5	3,807	5	59	6	<0.001
Neighborhood Urbanization
Rural/town	2,525	10	8,586	12	120	13
Non-metropolitan city	6,762	25	20,570	28	258	27
Suburban/urban	15,921	60	41,255	55	521	54
Unknown	1,232	5	3,800	5	59	6	<0.001

^aDistributions are presented only for those variables which were included as covariates in risk models for at least one of the site-specific or groups of cancer outcomes (see footnote of Table 2).

^bP-value based on the Pearson X² for all variables except for age and physical activity, for which the Mantel Haenszel X² was used.

^cAbbreviations: HT=hormone therapy, E=estrogen, E+P=estrogen plus progestin.

^d'Yes' = self-report of any of the following: high blood pressure, high blood pressure medications, heart attack/myocardial infarction, stroke, diabetes; 'No' = did not self-report any of those conditions.