If you are studying the rate of relapse for lung cancer after treatment, which of the following events would affect a participant’s person-time? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)1 pointtime period(s) when the patient is considered to have active lung cancerparticipant decides to no longer participate in the studytime of initial diagnosis with lung cancertime period(s) the patient is in remission from lung cancer
Question
If you are studying the rate of relapse for lung cancer after treatment, which of the following events would affect a participant’s person-time? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)1 pointtime period(s) when the patient is considered to have active lung cancerparticipant decides to no longer participate in the studytime of initial diagnosis with lung cancertime period(s) the patient is in remission from lung cancer
Solution
The person-time of a participant in a study of lung cancer relapse rates could be affected by several factors. Here are the options that apply:
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Time period(s) when the patient is considered to have active lung cancer: This would affect the person-time because it directly relates to the period when the patient is experiencing the condition being studied.
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Participant decides to no longer participate in the study: This would affect the person-time because the participant's data would no longer be collected for the study from the point they decide to leave.
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Time period(s) the patient is in remission from lung cancer: This would affect the person-time because it represents a period when the patient is not experiencing the condition being studied.
The time of initial diagnosis with lung cancer would not affect the person-time because it is a single point in time, not a period. Person-time is a measure of the amount of time each participant spends in the study, so it is affected by periods of time, not points in time.
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