Review Note

Observational Studies: Cohort Studies (aka {{c1::prospective}})

{{c2::Longitudinal study that follows a group of people over time who share a common characteristic or experience within a defined period (cohort)::definition}}

Strengths:

• {{c3::Good for studying common outcomes or rare outcomes that are common in certain groups::1 thing}}
  

Weaknesses:

• {{c4::Self-reporting can be inaccurate
• Self-selected vs. random populations
• Loss to follow-up over time
• Inadvertent crossover
• Can be very expensive::5 things}}