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. Author manuscript; available in PMC: 2009 Mar 1.
Published in final edited form as: Neuropsychopharmacology. 2008 Aug 13;34(4):899–911. doi: 10.1038/npp.2008.127

Table 1. Mean ± SEM number of 0.1 mg/kg/inj heroin injections delivered during each quintile of supplemental heroin self-administration sessions.

The time corresponding to each quintile is indicated in parentheses.

Quintile of Session Number Injections
Quintile 1 (1:00-5:12 pm) 10.63±0.78
Quintile 2 (5:12-9:24 pm) 6.72±1.28
Quintile 3 (9:24 pm -1:36 am) 3.70±1.04
Quintile 4 (1:36-5:48 am) 4.69±0.80
Quintile 5 (5:48-10:00 am) 10.86±0.39