Substance use disorders. Table 3 gives the baseline valuesand the change in these values at the four assessmentpoints (3, 6, 9, and 12 months after the beginning of thestudy) on the two outcomes of interest for the timeline follow-back: percent of days of abstinence for the most frequentlyused substance and percent of days of abstinencefrom all substances. Table 3 shows that the integrated caregroup had a greater increase in percent of days of abstinenceover baseline values than the routine care group atall assessment points during and after treatment, althoughthe differences were not significant at any singletime point. When the mean change in percent of days ofabstinence relative to baseline values over the four timepoints during and after treatment were compared betweenthe two groups (sum of the percent of days of abstinenceat 3, 6, 9, and 12 months subtracted from the baselinevalue), the percent of days of abstinence from allsubstances was greater for the integrated care group (median=19.99, range=–25.6 to 83.4, versus median=–6.52,range=–67.9 to 53.2) (U=86.5, p<0.03). However, the differencebetween groups in the mean percent of days of abstinencerelative to baseline for the most frequently usedsubstance was not significant (integrated care group median=17.76, range=–25.6 to 83.4, versus routine care groupmedian=–3.11, range=–46.2 to 54.6) (U=103.0, n.s.).
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