AtlasSession 3L8: Study designp.20–30, 98–101, 104–105, 110–111
Cohort studies
Fig. 1
Periprosthetic joint infection after hip arthroplasty: 100 diabetic and 1,000 non-diabetic patients followed 10 years (infections)
Fig. 1: a film running forward. Groups of patients start without infection and are followed for 10 years; after 10 years, 3 of 100 diabetic patients (3 in every 100) and 10 of 1,000 not diabetic patients (1 in every 100) have had it.
- Years followed
- 10 of 10
- Diabetic: infection so far
- 3 of 100
- In every 100 diabetic
- 3
- Not diabetic: infection so far
- 10 of 1,000
- In every 100 not diabetic
- 1
Study Timeline · First look
Level 1 · First look · Lecture 8 · p.20–30, 98–101, 104–105, 110–111
Understand following a group forward and counting who develops the outcome.
Describe prospective, retrospective and mixed cohorts and compute incidence rate, risk and odds from r, n and t.
Following a class (the step you are on)
Track pupils who walk or ride to school for a year and count who catches a cold.
Like following a class for a year and counting who catches a cold, we follow patients forward and count infections. Followed so far: 10 of 10 years.