Table 4.

Covariate Balance in 260 Matched Pairs of a High-Dose Teen and a Low-Dose Teen

Covariate	High Dose	Low Dose
Age	15.9	15.9
Black (1 = yes, 0 = no)	24%	25%
Other Nonwhite Race (1 = yes, 0 = no)	3%	3%
Gender (1 = female, 0 = male)	53%	52%
Mother graduated high school (0 = no, 1 = yes or missing)	80%	79%
Mother graduated college (0 = no or missing, 1 = yes)	27%	30%
Cable or satellite TV at home (1 = yes, 0 = no)	77%	77%
$\sqrt{\text{Hours}\text{of}\text{TV}\text{on}\mathrm{a}\text{weekday}}$	2.5	2.5
$\sqrt{\text{Hours}\text{of}\text{TV}\text{on}\mathrm{a}\text{weekend}}$	2.6	2.6
Music TV per month (e.g., MTV)
0 = never, …, 3 = 15 to 30 days/month	2.1	2.0
Sports channel per month (e.g., ESPN)
0 = never, …, 3 = 15 to 30 days/month	1.0	1.1
Music, dance, or theater (1 = yes, 0 = no)	72%	68%
Athletic teams or sports (1 = yes, 0 = no)	79%	77%
Clubs (e.g., Girl Scouts) (1 = yes, 0 = no)	46%	46%
Religious youth groups (1 = yes, 0 = no)	51%	48%
Other activities (1 = yes, 0 = no)	65%	65%
Ever smoked cigarettes
(0 = never, …, 4 = yes in the last 30 days)	1.3	1.2
Ever used marijuana (1 = yes, 0 = no)	40%	39%
Marijuana, last 12 months
(0 = never, …, 6 = 40 or more times)	.83	.78
Ever used inhalants (1 = yes, 0 = no)	10%	10%
Inhalants, last 12 months
(0 = never, …, 6 = 40 or more times)	.096	0.092
Any friends use drugs (1 = yes, 0 = no)	68%	68%

NOTE: Each mean or percentage is based on 260 teens.