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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: Drug Alcohol Depend. 2012 Oct 23;129(1-2):116–124. doi: 10.1016/j.drugalcdep.2012.09.018

Figure 4.

Figure 4

Mean breakpoints for drug and money as a function of dose condition, with filled squares representing mean drug breakpoints and open circles representing mean money breakpoints (n=9, ±1 SEM). A main effect of dose (F[6,48]=5.2, p<.001) was detected on drug breakpoints and all breakpoints except those under the low dose of tramadol and the high dose of codeine were significantly different from placebo (Dunnett post-hoc, p <.05). A main effect of dose was also detected on money breakpoints (F[6,48]=4.8, p<.001) and all money breakpoints were significantly different from placebo (Dunnett post-hoc, p<.05).

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