text: There were just over 100,000 unique individuals who tested positive for opiates-only or positive- 
  for-both between 2004 and 2013. The distribution of the 296,008 positive tests these individuals 
  gave, shows that the vast majority (55%) were only tested once (see Figure 4), which is likely to 
  be why the age statistics are quite similar between Table 3 and Table 4. However, within this 