As already pointed out by a quoted trauma expert, the participates of this research is not necessarily victims of 9/11. Some might just not have strong feelings about the event after 7 years had passed, not that they do not want to share.
With regard to the health condition / length of response correlation. We can argue that when one lets the negative memories stay in the system and be affected by it, one's health condition will not be high. The sharing or not sharing of such feelings therefore might not be the factor of the lower health condition, but the general negative mental deposition. However, we can also argue the other way around that when one's health condition is low, one tends to remember negative events more vividly and be affected by it for longer period of time. Which also does not support the conclusion drew by the author of the experiment either.
All in all, the experiment is not well designed to answer the questions at hand.









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