Table 1B.

2009 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	14,782	923	1,569	3,222	4,419	3,440	891	318
Percent of Total	100.0	6.2	10.6	21.8	29.9	23.3	6.0	2.2
Age
Mean Age (SD)	16.1 (1.2)	16.2 (1.2)	16.3 (1.2)	16.3 (1.2)	16.2 (1.2)	15.9 (1.2)	15.8 (1.3)	15.7 (1.2)
Gender (%)*
χ2(6) = 122.4, p < 0.005
Male	52.2	54.4	43.1	48.6	53.9	55.2	61.4	61.0
Race/Ethnicity (%)**
χ2(42) = 338.8, p < 0.005
White	61.4	47.7	56.0	62.0	65.3	62.8	59.7	43.9
African American	14.5	25.7	19.0	14.6	11.4	12.9	14.8	26.5
Hispanic	16.9	16.0	15.5	15.4	16.9	18.2	19.8	20.6
Asian/Pacific Islander	7.2	10.6	9.5	8.0	6.4	6.0	5.7	9.0
Clinical Variables (%)*
Sadness	26.0	50.3	36.9	29.9	22.4	18.5	18.8	26.4
χ2(6) = 525.4, p < 0.005
Tobacco Use	19.8	32.4	24.9	23.5	18.0	15.2	14.3	15.8
χ2(6) = 199.2, p < 0.005
Alcohol Use	42.3	54.8	51.0	48.3	41.2	35.8	29.3	26.7
χ2(6) = 264.3, p < 0.005
Suicidality (%)*
Suicidal Ideation	13.8	32.3	22.1	14.8	11.4	8.7	10.2	14.6
χ2(6) = 433.7, p < 0.005
Suicide Planning	10.9	26.8	17.2	12.4	8.4	6.8	7.3	12.2
χ2(6) = 386.7, p < 0.005
Suicide Attempt	6.3	24.1	12.6	5.9	3.9	3.2	4.4	12.7
χ2(6) = 565.1, p < 0.005
Attempt Requiring Treatment	2.0	13.9	3.6	1.6	0.8	1.0	1.4	5.6
χ2(6) = 505.4, 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%.