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

               Evaluation Research   Definitions    Designs  Sample size  Sample methods  Confounding 

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)