BS Nursing Epidemiology
nmdcat.online June 6, 2026

134. A study on vaccine effectiveness reports a significant reduction in disease, but the control group (unvaccinated) was much healthier and less exposed to the disease overall. What critical type of bias is likely present?

A. Information bias.
B. Selection bias.
C. Observer bias.
D. Confounding.

📖 Additional Information

  • Information bias.
  • Selection bias.
  • Observer bias.
  • Confounding.

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