in-a-5-year-cohort-60-of-500-supplement-users-developed-outcome-z-and-30-of-500-

Question

In a 5-year cohort, 60 of 500 supplement users developed outcome Z and 30 of 500 non-users developed outcome Z. Calculate the risk ratio of outcome Z for supplement users versus non-users.

Accepted Answer

2.0 (supplement users have twice the risk of outcome Z compared to non-users)

Answer

Insufficient information to calculate any ratio because person-time is required for cohort calculations

Answer

1.0 (no difference in risk between users and non-users)

Answer

0.5 (supplement users have half the risk of outcome Z compared to non-users)