The plus sign beside survival time for subjects two (2) and six (6) in the table above indicate observations on these subjects were censored. This means the subjects

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The plus sign beside survival time indicates that the event of interest (death in this case) did not occur during the study period. In other words, these subjects were censored - either they withdrew from the study before the end of the study, or they were lost to follow-up. The plus sign does not give any information about the stage of illness, risk factors, or cause of death. Therefore, option C is the best choice as it correctly explains the meaning of censorship.

The Plus Sign Beside Survival Time for Subjects Two (2)