Table 1.

Descriptive Characteristics of Participants in adolescence at Wave I (1994–1995; N=18,642) and young adulthood at Wave IV (2007–2009; N=14,195) of the National Longitudinal Study of Adolescent to Adult Health.

Participant Characteristic	Wave I	Wave IV
	N (%)
Individual-Level	(N=18,642)	(N=14,195)
Age (years), mean (SD)	15.6 (1.7)	29.0 (1.7)
Gender
Male	9,264 (49.7)	6,672 (47.0)
Female	9,378 (50.3)	4,523 (53.0)
Race/Ethnicity
White	9,436 (50.6)	7,513 (52.9)
Black	3,853 (20.7)	2,905 (20.5)
Asian	1,189 (6.4)	788 (5.6)
Hispanic	3,118 (16.7)	2,229 (15.7)
Other	268 (1.4)	179 (1.3)
Multiracial	778 (4.1)	581 (4.1)
Parental Education (Wave I)
Less than high school	2,378 (12.7)	1,697 (12.0)
High school graduate / GED	4,875 (26.1)	3,687 (26.0)
Some college	5,474 (29.3)	4,227 (29.8)
College graduate or beyond	5,915 (31.7)	4,584 (32.3)
Parent Receipt of Public Assistance (Wave I)
No	16,860 (90.4)	12,939 (91.2)
Yes	1,782 (9.5)	1,256 (8.9)
School currently in session during interview
No	11,570 (62.1)	N/A
Yes	7,072 (37.9)	N/A
Screen Time (Hours per week), mean (SD)	22.8 (20.3)	21.9 (19.4)
Screen Time
<14 hours per week	7,632 (40.9)	5,740 (40.4)
≥14 hours per week	11,010 (59.1)	8,455 (59.6)
	Mean (SD)
School-Level	(N=128 schools)	(N=128 schools)
School Size	145.6 (160.9)	110.9 (119.2)
Percent White Race	47.5 (25.5)	47.5 (25.5)
Percent on Public Assistance	10.4 (9.4)	10.4 (9.4)
Percent Parent with College Degree	31.7 (16.9)	31.7 (16.9)
Neighborhood-Level (Census Tract)	(N=2,285 neighborhoods)	(N=1,940 neighborhoods)
Neighborhood Size, mean (SD)	8.15 (20.4)	7.32 (17.2)
Percent White Race	66.3 (33.0)	66.8 (32.7)
Percent of Residents on Public Assistance	10.8 (10.0)	10.6 (9.7)
Percent of Residents with College Degree	23.5 (14.6)	23.7 (14.6)