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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Am J Addict. 2011 Jul 18;20(5):435–440. doi: 10.1111/j.1521-0391.2011.00152.x

Figure 1.

Figure 1

A depiction of change in total scores on the Sleep Problems Questionnaire (SPQ) from baseline to 6 months as a function of drinking status at 6-months. Adjusting for gender and psychiatric severity, a significant interaction between time and drinking group is shown by parallel decreases in scores (improvement in sleep) among patients achieving abstinence (n=107) or drinking moderately (n=29), whereas patients who relapsed to heavy drinking (n=89) show no improvement in sleep (F=5.71, df=2,220, p=.004). Groups did not differ significantly in baseline sleep scores.