In a university cafeteria, 200 students ate the chicken salad. 80 developed gastroenteritis within 24 hours. Of the 150 students who did not eat the chicken salad, 20 developed gastroenteritis.
Never try to calculate in your head. Label your rows as "Exposed/Unexposed" and your columns as "Disease/No Disease." 5.1.1 epidemiology study analysis practice problems answers
Cases (with cancer): 58 consumed 80+g/day, 442 consumed In a university cafeteria, 200 students ate the
where a = 200, b = 100, c = 100, and d = 300 Never try to calculate in your head
level, meaning the observed association could be due to chance. Identify Study Weakness/Bias : Potential recall bias
Exposure is a potential protective factor; lower risk in exposed group. Problem 1 OR: ≈0.44is approximately equal to 0.44 (Protective) Problem 2 RR: ≈2.47is approximately equal to 2.47 (Risk factor) Problem 3 OR: ≈1.60is approximately equal to 1.60 (Potential risk, but statistically non-significant at 5.1.1 Practice Problems Pt.3 (docx) - CliffsNotes