Two people with different body sizes want to compare their strength levels when lifting the same object. for a fair comparison, what should they measure?

Two people with different body sizes want to compare their strength levels when lifting the same object. For a fair comparison, what should they measure? 
I believe the correct answer for this question is who can lift the longest :)
If you need more additional help, please feel free to leave me a comment below :) 

Major sources of stress, such as a death or divorce, problems in family relationships, job loss, school, and substance abuse, can trigger or aggravate some mental disorders in some people. but not everyone who goes through those things develops a mental illness

Ithink the correct answer would be that since the disease is passed by a hand shake and can be cured with antibiotics that it could be an infection. an example could be that once when i was working in a bush camp, i got blood poisoning from blood blisters that got infected. our cook did not wash his hands after going to the bathroom and he passed staphyloccus on to the crew he fed. one other person also got a bad similar infection on the side of his face. i had to be rescued by helicopter and taken to the hospital so i wouldn't die!