b. Based on this data, Warren and Marshall hypothesized that there was a causal relationship between ulcers and bacterial infection. But there were 4 patients with ulcers that were negative for the bacteria. Why is this not significant? Answer: Data that showed 4 patients with ulcers became negative for the bacteria is significant because those four had taken non-steroidal, anti-inï¬‚ammatory drugs and the said drugs are known to induce ulcers. c. If there is a causal relationship between the presence of H. pylori and ulcers, how might you explain that 50% of the patients with a normal endoscopic examination were infected with the bacteria? d. In your own words, explain the results presented in Table III. What do you conclude from this data?
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