Table 2.

Transitions in cannabis use over time from any t-1 to t (ie, over any 1 consecutive wave), any t-2 to t (ie, over any 2 consecutive waves), and any t-3 to t (ie, over any 3 consecutive waves) in a combined sample of NEMESIS-2 study and EDSP study

	Transition from t-1 to t					Transition from t-2 to t					Transition from t-3 to t
	Cannabis use t					Cannabis use t					Cannabis use t
Cannabis use t-1		0	1	Total	Cannabis use t-2		0	1	Total	Cannabis use t-3		0	1	Total
No	N a	15 305	378	15 683	No	N a	9,404	426	9830	No	N a	4275	306	4581
	%	97.6	2.4	100.0		%	95.7	4.3	100.0		%	93.3	6.7	100.0
Yes	N a	278	362	640	Yes	N a	207	160	367	Yes	N a	157	48	205
	%	43.4	56.6	100.0		%	56.4	43.6	100.0		%	76.6	23.4	100.0
Total	N a	15 583	740	16 323	Total	N a	9,611	586	10 197	Total	N a	4432	354	4786
	%	95.5	4.5	100.0		%	94.3	5.8	100.0		%	92.6	7.4	100.0

^aNumber of observations clustered within individuals (participants were interviewed 4 times over time).