Figure 2 shows the relationship between different frequencies of AA attendance and the percent change in both pro-abstinent and pro-drinking network ties from treatment intake to the 9-month follow-up. As shown, increasing AA attendance appears to exert a substantial monotone effect on decreasing pro-drinking network ties and a similar, although less substantial, linear effect on increasing pro-abstinent network ties. Among aftercare patients, increasing attendance from none or once or twice per week to three or more times per week reduced the number of pro-drinking network ties by a further 20% (from -45.54 to -65.66); among outpatients this reduction was in the range of 20-30%. Similarly, increasing AA attendance from none to three times per week was associated with a 10% and 15% increase in the number of pro-abstinent network ties among the aftercare and outpatient samples, respectively.
