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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Addiction. 2016 Jun 14;111(10):1825–1835. doi: 10.1111/add.13442

Table 2b.

Wave completion rate

Waves completed Frequency Percent of youth
1 wave 471 7.24
2 waves 419 6.44
3 waves 626 9.62
4 or more waves 4,993 76.7

Note: Youth had to complete two or more waves to be included in trajectory analyses.