Fever with chills vs fever with chills and rigor.....what's the difference and what are the respective causes?

what are longitudinal studies?

Is case control study a longitudinal study?

Is retrospective cohort a longitudinal study?

Are longitudinal studies descriptive studies?

Like period prevalence is longitudinal study

But cohort is analytical study so how it is longitudinal study.

Sir pls clear this concept

Observational analytical Studies could be done

  1. At same point (or time period) called as cross sectional studies

  2. Or include follow ups or interviews, where the same group of population is assessed over and over again (usually referring to cohort studies)

sir so what are longitudinal studies?