AtlasSession 3L8: Study designp.3–8
Classification
- Study designs primer
- Classification
- Next: Cross-sectional studies
Fig. 1
Classifying a study: who assigned the exposure, and where the study starts in time (derived from L8 p.3–8)
Fig. 1: decision flowchart “What kind of study is this?”. Case: 2,000 knee MRIs read today. 2,000 knee MRIs are read today for cartilage lesions, and each person’s BMI is recorded at the same visit. Question: Who decided which treatment each subject got? Answers: 1 Researchers, by chance, 2 A new policy, no chance, 3 Nobody: just watched.
- Case
- 2,000 knee MRIs read today
- Question
- who assigned it?
- Your answers
- none yet
- How it’s going
- — (answer the first question to see how it’s going)
- Score
- 0/7 (no cases finished yet)
Decision Flowchart Walker · First look
Level 1 · First look · Lecture 8 · p.3–8
Tell study designs apart by where they start in time and who decides the treatment.
Classify a study as descriptive, cross-sectional, cohort, case-control, RCT or quasi-experimental from who assigns the exposure and where the study starts in time.
Photo, film or flashback (the step you are on)
One moment; a story running forward; or starting at the ending and looking back.
A photo catches one moment; a film runs forward; a flashback starts at the ending and looks back. Case: 2,000 knee MRIs read today. Photo, film or flashback? Your answers so far: none yet.