What does 'followed for' mean in the following sentence.
It is explicit there are 121 000 subjects. But can we rewrite this sentence without ' followed for'. Does it add a special meaning to the sentences scientifically?
The study included more than 121,000 men and women followed for an average of 24 years.
How about my sentence:
The study included more than 121,000 men and women whose average age is 24 years old.
Could you give me some more examples in this usage to understand how to use it properly please?