We conducted another sub-cohort analysis restricted to workers who were employed in a given calendar year and with observation starting from that point onwards. The years of employment were from 1985 to 2012, and SIRs were calculated for each sub-cohort.
We conducted another sub-cohort analysis restrictedto workers who were employed in a given calendaryear and with observation starting from that pointonwards. The years of employment were from1985 to 2012, and SIRs were calculated for eachsub-cohort.