text: estimated percentage of the total incidence captured by the observed incidence. In other words, 
  our lag-to-treatment distribution suggests that of the 8,960 individuals who began use in 2005, 
  85 per cent will have come to treatment by 2014; so by adding the other 15 per cent on (1,523), 
  we reach our estimated total incidence for that year: 10,483. 