Lets say youve conducted a cohort study to determine some long-term consequences of surgical…

Lets say youve conducted a cohort study
to determine some long-term consequences of surgical treatment of patients with
cataracts. For 174 patients who underwent surgery and 103 other patients with
cataracts who did not, youve used records of the state department of motor
vehicles to determine who has been involved in a motor vehicle crash as a
driver. From periodic interviews with study subjects, you are able to estimate
the number of miles each one has driven during a 2-year follow-up period.

Assume the two groups of patients are
exactly comparable with respect to baseline

Lets say youve conducted a cohort study
to determine some long-term consequences of surgical treatment of patients with
cataracts. For 174 patients who underwent surgery and 103 other patients with
cataracts who did not, youve used records of the state department of motor
vehicles to determine who has been involved in a motor vehicle crash as a
driver. From periodic interviews with study subjects, you are able to estimate
the number of miles each one has driven during a 2-year follow-up period.

Assume the two groups of patients are
exactly comparable with respect to baseline characteristics that predict
automobile crash occurrence, including driving behavior, and that no
misclassification is present in the study.

a. Estimate the influence of cataract
surgery on crash rate while driving.

b. Estimate the overall influence of
cataract surgery on the risk of an automobile crash, in other words, that which
would include a possible influence of the surgery on driving behavior.

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