text: The same applies for DALYs;**WHO/ILO estimates sum up to approximately 63% of the ICOH values**. 
  The main difference is due to the approximately 2.3 million DALYs that ICOH calculated for other work- 
  related diseases. WHO/ILO applied strict methodological criteria and consequently excluded quite a 
  large number of studies as a base for their estimates. They write: 
  
  *‘Third, it must be noted that not all occupational risk factors and attributable burdens of disease have*
  *yet been quantified. The production of estimates for some pairs was not possible in this estimation cycle,*
  *such as: occupational exposure to biological risk factors and infectious diseases; occupational exposure*
  *to psycho-social risk factors and mental health outcomes; and occupational exposure to ambient air*
  *pollution and its various health outcomes. Further, while there are established methods for estimating*
  *the burdens of silicosis, asbestosis, coal worker’s pneumoconiosis and unspecified pneumoconiosis*
  *attributable to occupational exposure to dusts and fibers, WHO and the ILO are currently reviewing*
  *these methods and the available bodies of evidence (10); these pairs were therefore not included in this*
  *estimation cycle. While this means that the work-related burden of disease is**almost certainly higher***
  ***than the current estimate of selected pairs**, the addition of such pairs in future will broaden the scope*
  *of these estimates and capture the work-related burden of disease more comprehensively.’*224 