Table 1.

Number of Participants of Each Age at Each Assessment Wave

Age	Assessment Wave 1	Assessment Wave 2	Assessment Wave 3	Assessment Wave 4	Total N
10	6				6
11	104				104
12	119				119
13	255	5			260
14	1,047	82	1		1,130
15	878	110			988
16	762	153			915
17	1,152	795			1,947
18	479	742			1,221
19	99	375	49		523
20	32	465	14		511
21	16	238	23		277
22	2	41	19		62
23	20	127	97		244
24	38	335	530		930
25	83	408	423	15	929
26	17	90	76	3	186
27	8	15	19	1	43
28	3	25	131	99	258
29	23	117	453	376	969
30	8	38	100	119	265
31	4	4	13	13	34
32			1		1