Impact of the Project P.A.T.H.S. in the Junior Secondary School Years: Objective Outcome Evaluation Based on Eight Waves of Longitudinal Data

Table 1

Number of collected questionnaires across waves.

N (Schools)	Wave 1	Wave 2	Wave 3	Wave 4	Wave 5	Wave 6	Wave 7	Wave 8
	48	47^a	44^b	44	43^c	43	43	43
N (Participants)	7,846	7,388	6,939	6,697	6,876	6,733	6,116	5,934
Control Group	3,797	3,654	3,765	3,698	3,757	3,727	3,442	3,272
Male	1,936	1,876	1,896	1,888	1,874	1,894	1,770	1,663
Female	1,613	1,619	1,666	1,599	1,682	1,679	1,592	1,554
Experimental Group	4,049	3,734	3,174	2,999	3,119	3,006	2,674	2,662
Male	2,154	1,998	1,691	1,548	1,632	1,591	1,408	1,427
Female	1,745	1,571	1,283	1,259	1,312	1,278	1,155	1,191
% of successfully matched	98%	96%	97%	98%	99%	97%	93%	91%

^a1 Experimental school (n = 207) had withdrawn after Wave 1.
^b3 Experimental schools (n = 629) had withdrawn after Wave 2.
^c1 Experimental school (n = 71) had withdrawn after Wave 4.