text: 16 The figure in Table 8 is 721, but adjusting for the missing month of data this becomes 787. 
  17 Assuming an arrest rate of 17% (see appendix), and that 50% of OCUs do not commit acquisitive crime (Gossop et al., 
  2003) and the coverage figures shown in the appendix. 
  
  New opiate and crack-cocaine users: characteristics and trends  21 