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Please help with this question: A potential confounding variable should be included in a multiple proportional...

Please help with this question:

A potential confounding variable should be included in a multiple proportional hazards regression model if ___

  1. it is an independent risk factor for the outcome

  1. it is a statistically significant predictor for the outcome

  1. it differs in frequency between exposed and unexposed study subjects

  1. choices a and c

  1. choices a and b

  1. all of the above
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Answer #1

choices a and b is the answer.

Reason:

A potential confounding variable should be included in a multiple proportional hazards regression model if

- it is an independent risk factor for the outcome.

- it is a statistically significant predictor for the outcome.

therefore, choices a and b is the answer.

thank you

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