Sometimes, age-specific death counts are hard to come by. Something happened that doesn’t allow you to know how many people died in each age group, but you know the total number of people who died. So how do you account for differences in the age distribution of the population? Glad you asked!
When comparing two populations, it is essential that you know if the differences are due to different age distributions. Age can confound a lot of findings, especially if the outcome is strongly influenced by age.