Table 2.

Covariates Before Matching and Their Rank Correlations With Dose of Exposure to the Media Campaign

Covariate	Kendall’s τ	P-Value
Age	−.10	.0013
Black (1 = yes, 0 = no)	.00	.9500
Other Nonwhite Race (1 = yes, 0 = no)	−.02	.6300
Gender (1 = female, 0 = male)	−.01	.8300
Mother graduated high school (0 = no, 1 = yes or missing)	.00	.9300
Mother graduated college (0 = no or missing, 1 = yes)	.07	.0600
Cable or satellite TV at home (1 = yes, 0 = no)	.01	.7400
$\sqrt{\text{hours}\text{of}\text{TV}\text{on}\mathrm{a}\text{weekday}}$	.07	.0300
$\sqrt{\text{hours}\text{of}\text{TV}\text{on}\mathrm{a}\text{weekend}}$	.09	.0056
Music TV per month (e.g., MTV)
0 = never, …, 3 = 15 to 30 days/month	.10	.0048
Sports channel per month (e.g., ESPN)
0 = never, …, 3 = 15 to 30 days/month	.10	.0048
Music, dance, or theater (1 = yes, 0 = no)	.04	.2500
Athletic teams or sports (1 = yes, 0 = no)	.11	.0047
Clubs (e.g., Girl Scouts) (1 = yes, 0 = no)	−.01	.8200
Religious youth groups (1 = yes, 0 = no)	−.05	.2300
Other activities (1 = yes, 0 = no)	.10	.0098
Ever smoked cigarettes
(0 = never, …, 4 = yes in the last 30 days)	.01	.7600
Ever used marijuana (1 = yes, 0 = no)	.00	.9900
Marijuana, last 12 months
(0 = never, …, 6 = 40 or more times)	.01	.8100
Ever used inhalants (1 = yes, 0 = no)	.03	.4300
Inhalants, last 12 months
(0 = never, …, 6 = 40 or more times)	.02	.6400
Any friends use drugs (1 = yes, 0 = no)	.02	.6900