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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: Contemp Clin Trials. 2011 Oct 8;33(1):197–205. doi: 10.1016/j.cct.2011.09.018

Table 2. Number of prize drawings per week as a function of negative CO levels.

Study Week Number draws for negative CO Bonus for negative CO since week 4 Max Draw/Sample
4 4 0 4
4 4 0 4
5 5 1 6
5 5 1 6
6 6 1 7
6 6 1 7
7 7 1 8
7 7 1 8
8 8 1 9
8 8 1 9
9 9 1 10
9 9 1 10
10 10 1 11
10 10 1 11
Total 110
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