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Table 6 Change in primary outcomes for various periods of the study for participants who dropped out early (0 or 1 week) and for those who received full treatment (12 weeks).

From: Are alcoholism treatments effective? The Project MATCH data

Total Improvement      
  Percent days abstinent      
   Group Pretreatment Follow-up t= df p= Effect
   0 33 72 1.95 85 .000 1.498
   1 29 64 9.30 105 .000 1.320
   12 30 86 31.74 354 .000 2.042
  Drinks per drinking day      
   0 17.9 7.3 1.75 85 .000 1.534
   1 22.8 7.6 11.99 105 .000 1.552
   12 15.7 3.2 34.68 354 .000 2.494
Instantaneous Improvement (week 1)      
  Percent days abstinent      
   Group Pretreatment Week 1 t= df p= Effect
   0 32 81 9.17 56 .000 1.981
   1 30 69 8.43 87 .000 1.447
   12 30 92 35.30 339 .000 2.317
  Drinks per drinking day      
   0 18.7 3.8 1.75 56 .000 2.097
   1 22.5 8.7 9.69 87 .000 1.770
   12 15.6 1.5 35.28 339 .000 2.909
Acute Treatment Phase (weeks 1 & 12)      
  Percent days abstinent      
   Group Week 1 Week 12 t= df p= Effect
   0 81 81 .19 56 .852 -.025
   1 69 63 1.69 87 .098 -.174
   12 92 96 2.82 339 .005 .155
  Drinks per drinking day      
   0 3.8 5.0 1.08 56 .283 -.172
   1 8.7 8.8 .82 87 .415 -.090
   12 1.5 1.1 2.05 339 .041 .126