Because YLL measure the incident stream of lost years of life due to deaths, an incidence perspective has also been taken for the calculation of YLD in the. The basic formula for calculating the YLL for a given cause, age or sex, is: where: YLL = years of life lost due to premature mortality. The disability-adjusted life year (DALY) is a measure of overall disease burden, expressed as. What is a YLL? What is a YLD? What is life expectancy? What is HALE? What is TFR? What is SDI? What are sequelae? What are health states? What are. YLD ¼ 1 б 60 ю40. These predicted levels control for variation explained by year and country.