Duration of continuous abstinence | Multicenter 2002 | Elche (Alicante) 2005 | Madrid 2004-2007 | Zaragoza 2002-2007 | Albacete 2008-2009 |
3 months | 53.1% | 36.1% | - | 41.3% | 48.6% |
6 months | 38.8% | 22.7% | 58.5% | - | 34.2% |
9 months | - | 14.9% | - | - | 29.1% |
12 months | - | 11.4% | 54.9% | - | 27.7% |