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SPECIAL TOPICS:   Histograms/Central tendency    Sensitivity/Specificity   Rates   Critical review 

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Note that we do not often use the mean to describe onset times.  The reason is that it is too much influenced by a few extreme values.

note that the intervals in the above chart would really be at least one-stage more precise than are shown here.   For example, "51-60" really means 51.00 to 60.99 (if we mean decimal hours) or 50:00 to 60:59 (if we mean hours and minutes)