Table 3.

Rates of alcohol and marijuana initiation among W1 substance-naïve participants

	Full drink		Marijuana use
	n = 819		n = 826
	% onset by W2	% onset by W3	% onset by W2	% onset by W3
Full sample	n = 93; 12.67%	n= 241; 35.76%	n = 75; 10.15%	n= 143; 21.22%
% youth reporting substance use by W1 full, partial, and unrestricted movie restriction categories
Fully restricted	n = 5; 5.95%	n = 18; 21.18%	n = 7; 9.33%	n = 11; 14.29%
Partially restricted	n = 23; 6.76%	n = 102; 31.19%	n = 15; 4.59%	n = 54; 16.98%
Unrestricted	n = 43; 17.20%	n = 101; 45.29%	n = 40; 14.39%	n = 66; 27.39%
% youth reporting substance use by W1 R-rated movie restriction categories
No, and I never watch them	n = 3; 2.00%	n = 25; 16.45%	n = 6; 4.41%	n = 14; 10.07%
No, but I watch them anyway	n = 13; 28.89%	n = 25; 59.52%	n = 8; 17.02%	n = 18; 38.30%
Yes, if supervised by an adult	n = 12; 5.24%	n = 69; 31.80%	n = 8; 3.65%	n = 32; 15.38%
Yes, without adult supervision	n = 43; 17.06%	n = 101; 44.89%	n = 40; 14.29%	n = 66; 27.16%