Table 1A.

2007 YRBS sample description and distributions

	Total Sample	Self-Reported Sleep Duration
		≤ 4 h	5 h	6 h	7 h	8 h	9 h	≥ 10 h
Total	12,154	758	1,249	2,740	3,623	2,792	742	250
Percent of Total	100.0	6.2	10.3	22.5	29.8	23.0	6.1	2.1
Age
Mean Age (SD)	16.2 (1.2)	15.9 (1.2)	16.4 (1.3)	16.4 (1.2)	16.4 (1.2)	16.2 (1.2)	15.7 (1.2)	15.9 (1.2)
Gender (%)*
χ2(6) = 89.39, p < 0.005
Male	52.1	43.9	45.0	52.2	52.5	58.4	60.3	50.3
Race/Ethnicity (%)**
χ2(42) = 291.4, p < 0.005
White	62.7	52.3	55.8	62.1	67.7	64.9	57.1	44.9
African American	14.7	20.1	20.0	16.5	11.7	12.9	14.4	22.5
Hispanic	15.8	17.0	17.0	13.8	14.9	15.9	22.6	22.3
Asian/Pacific Islander	6.8	10.3	7.6	7.7	5.7	6.3	6.0	10.3
Clinical Variables (%)*
Sadness	28.2	52.2	39.6	32.5	23.1	20.4	23.5	30.7
χ2(6) = 446.7, p < 0.005
Tobacco Use	21.2	38.6	26.7	25.0	19.6	14.4	14.9	21.2
χ2(6) = 199.2, p < 0.005
Alcohol Use	46.1	58.5	55.9	52.4	45.5	36.7	35.1	43.5
χ2(6) = 264.3, p < 0.005
Suicidality (%)*
Suicidal Ideation	14.6	34.6	19.3	17.8	11.7	8.5	13.0	17.8
χ2(6) = 384.6, p < 0.005
Suicide Planning	11.2	30.3	15.7	13.5	8.2	6.3	8.5	16.8
χ2(6) = 416.3, p < 0.005
Suicide Attempt	6.9	25.1	7.8	8.0	5.0	3.6	5.9	12.5
χ2(6) = 395.5, p < 0.005
Attempt Requiring Treatment	1.9	10.0	3.0	1.9	1.1	0.6	1.6	4.8
χ2(6) = 257.5, p < 0.005

^*Values indicate the percent of respondents answering “Yes” for each sleep duration (identified by column). “No” responses are not shown. Columns and rows therefore do not add to 100%.

^**Percent reporting for each column. All responses are present. Columns add to 100%.