text: Reading down the year columns, the table shows that of the 6,449 people who presented for 
  opiate/crack treatment for the first time in 2013, 376 said they had begun using in 2005. Another 
  470 said they started using in 2006, and so on. 
  
  Reading across the table shows that of all those who said they began using opiates/crack in 
  2005 (8,960), 1,305 also presented to treatment for the first time in that year (which is 15 per 
  cent of the observed cohort from Table 11 and 12 per cent of our estimated total cohort from 
  Table 12). Another 1,508 presented for the first time a year later, and so on. The first number in 
  the totals column (8,960) therefore represents all individuals who said they began using in 2005. 
  It is therefore the ‘observed’ incidence level. The column to the right of this is the cumulative 
  percentages from the estimated lag-to-treatment distribution in Table 12. This shows the 