shirini2
Forum Senior
Topics: 27
Posts: 86
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To estimate survival from a follow-up study, "time zero" must be defined precisely for each patient. This is best ensured by
1) "back dating" the entrance to the date of onset of the first symptoms, as obtained from the history.
2) enrolling all patients on the same calendar date.
3) measuring from the first instance when each patient's symptoms met certain criteria for severity.
4) measuring from the time the disease is detected by a screening program.
5) selecting all patients at clinically comparable points in the course of their disease.
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| gingko
Forum Senior
Topics: 13
Posts: 226
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5..
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Old McDonald had an ERAS inbox..with a reject here and a reject there..here a reject, there a reject,everywhere a reject, reject.
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| shirini2
Forum Senior
Topics: 27
Posts: 86
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Thanks for answering but any explanation gingko?
confused between 3 and 5.?
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| shirini2
Forum Senior
Topics: 27
Posts: 86
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any body can help with this question?
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| Vietnamese
Forum Elite
Topics: 12
Posts: 285
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2-
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Nothing is impossible.
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| shirini2
Forum Senior
Topics: 27
Posts: 86
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Thank you Vietnamese But do you have any explanation or references? why not 3?
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| Vietnamese
Forum Elite
Topics: 12
Posts: 285
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According to Kaplan's statement of survival analysis, the starting point is 100% survival. That's all. (Kaplan notes 2006-2007, page 118)
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Nothing is impossible.
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| guangyu
Forum Elite
Topics: 29
Posts: 308
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you can not enroll all patients in same days
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| Korotkoff
Forum Senior
Topics: 15
Posts: 168
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agreed with Vietnamese.
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| shahnaz.r
Forum Junior
Topics: 7
Posts: 77
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correct answer is probably 3
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| sherry39
Forum Junior
Topics: 3
Posts: 105
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it is follow up....hence word clinically defined the disease as well as treatment....hence5
3 only show disease grade.,doesnt show therapy
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