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Researchers decide to set up a study to see if there is an association between drinking water from the wells on the school property before

Researchers decide to set up a study to see if there is an association between drinking water from the wells on the school property before getting a gastrointestinal illness in November 1972. All 362 people agreed to participate. None experienced gastrointestinal illness before November. 251 drank water either at the school or in the apartment that used the same well water in November. Of those, 192 later developed gastrointestinal illness. 21 People who claimed they did not have any of the water also got sick. What is the relative risk? A statistician comes in and does multivariate analysis for the same research question. She finds a lower adjusted RR of 3.58 (95% CI: 3.28-3.88). Is the relative risk statistically significant after adjustment? How can you tell? What does "adjustment mean in this scenario? Name some variables that might have been adjusted for

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