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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: Addict Behav. 2009 Nov 12;35(4):318–324. doi: 10.1016/j.addbeh.2009.11.003

Fig. 4.

Fig. 4

Four left columns: Percentage of random prompts at which participants reported smoking tobacco, by degree of reported dual craving for heroin and cocaine. For dual-craving data, we used only random-prompt reports in which craving ratings for cocaine and heroin were identical (69.4% of the 27,760 random-prompt reports). Two right columns: Percentage of event-contingent prompts at which participants reported smoking tobacco. The denominators for the six bars were: 11,782 (dual craving rated 0); 6,270 (dual craving rated 1); 505 (dual craving rated 2); 696 (dual craving rated 3); 605 (event-contingent dual-craving entry); 229 (event-contingent dual-use entry). The bars show raw percentages, whereas the statistical results are adjusted for sex, race, age, and location. The pattern of covariate-adjusted percentages (not shown) was similar to the pattern of raw percentages.