If you are studying the rate of breast cancer, 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 pointparticipant decides to no longer participate in the studydeathpatient undergoes a double mastectomy diagnosis with uterine cancerloss to follow-up
Question
If you are studying the rate of breast cancer, 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 pointparticipant decides to no longer participate in the studydeathpatient undergoes a double mastectomy diagnosis with uterine cancerloss to follow-up
Solution
In a study of the rate of breast cancer, the following events would affect a participant's person-time:
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Participant decides to no longer participate in the study: This would affect person-time because the participant's time in the study would be cut short.
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Death: This would also affect person-time as the participant would no longer be contributing time to the study.
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Patient undergoes a double mastectomy: This could potentially affect person-time if the procedure results in the participant being unable to continue in the study for a period of time.
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Diagnosis with uterine cancer: This could affect person-time if the participant needs to take time away from the study for treatment or if they decide to leave the study.
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Loss to follow-up: This would affect person-time as the participant would no longer be contributing time to the study.
So, all the events listed would affect a participant's person-time in a study of the rate of breast cancer.
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