A (treatment cohort) can be from a randomized clinical trial.
A doctor may examine effects of (drug use) by following a cohort of adolescents.
Researcher may compare boys from a cohort of a (youth study).
A cohort can be constituted-of-or-filled-with (school student athletes).
(Survey results) can be from a cohort of (school student athletes).
Some (welfare cohorts) may be exempted from (work requirements).
Some agreement can be about measurring (cohort progression).